There is no difference in Pius V promulgating a liturgy which he codified and Paul VI doing the same. Neither seems to me to be infallible articles of faith.

The key difference here is the Liturgy promulgated by Pius V was the liturgy already in use by the Canons of Rome,

It has been perpetually the teaching of the Church that Catholics are bound to their customary rite. That is why, in the controversy regarding Greek versus Roman rite, which was settled by the Council of Florence under Pope Eugene IV, the Council solemnly defined that the Greeks are to confect the Sacraments of the Eucharist according to their customary rite and therefore, they must use the leavened bread. In the Roman Church they must follow their customary rite of their ritual church, which is the proper rite of the Roman Church.

This is what the faith dictates and decrees. That is why it has always been regarded as an act of schism if even a Pope were to attempt to change the rites, to alter the ceremonies of the liturgy. The Popes have solemnly professed for so many centuries that this is not within their power. This is also taught by the official designated theologian of the Council of Basel [which eventually moved to Florence and became the Council of Florence]. This theologian, Cardinal Juan de Torquemada, was the theologian responsible in the formulation of the doctrines that were defined at Florence. Torquemada explains that if the Pope were to change the rites, or attempt to change the rites, he would be committing an act of schism.

Thus, regardless of Quo Primum, it had been a well established teaching of the Catholic Faith that the Roman rite cannot be trashed and replaced with a new rite. To do so is contrary to the law of God as defined by the infallible Magisterium of the Church.

Beyond that, however, when we look at Quo Primum, we see that Pope St. Pius V refers to the Roman rite as that rite "which has been handed down in the Roman Church." He was clearly designating that the rite in the Missal that he codified is precisely that rite which is the customary rite, "the received and approved rite customarily used in the solemn administration of the Sacraments." [Trent, Sess. 7, Cn. 13]

Therefore, the so-called Tridentine Rite of Mass is the only lawful rite that can ever exist in the Roman Church. The Tridentine Rite is the Roman Rite. And just as it would be considered absolutely outrageous for anyone to try to impose a new rite [or even the Roman rite] on the Greek Church, likewise, it is an outrage for anyone to impose a new rite on the Roman Church.

CHANGES IN MASS FOR GREATER APOSTOLATE
Pope Paul VI
Address to a General Audience, November 26, 1969
Our Dear Sons and Daughters:

1. We ask you to turn your minds once more to the liturgical innovation of the new rite of the Mass. This new rite will be introduced into our celebration of the holy Sacrifice starting from Sunday next which is the first of Advent, November 30 [in Italy].

2. A new rite of the Mass: a change in a venerable tradition that has gone on for centuries. This is something that affects our hereditary religious patrimony, which seemed to enjoy the privilege of being untouchable and settled. It seemed to bring the prayer of our forefathers and our saints to our lips and to give us the comfort of feeling faithful to our spiritual past, which we kept alive to pass it on to the generations ahead.

3. It is at such a moment as this that we get a better understanding of the value of historical tradition and the communion of the saints. This change will affect the ceremonies of the Mass. We shall become aware, perhaps with some feeling of annoyance, that the ceremonies at the altar are no longer being carried out with the same words and gestures to which we were accustomed—perhaps so much accustomed that we no longer took any notice of them. This change also touches the faithful. It is intended to interest each one of those present, to draw them out of their customary personal devotions or their usual torpor.

4. We must prepare for this many-sided inconvenience. It is the kind of upset caused by every novelty that breaks in on our habits. We shall notice that pious persons are disturbed most, because they have their own respectable way of hearing Mass, and they will feel shaken out of their usual thoughts and obliged to follow those of others. Even priests may feel some annoyance in this respect...

German bishops [did not care] about Cranmer

"It has been perpetually the teaching of the Church that Catholics are bound to their customary rite. That is why, in the controversy regarding Greek versus Roman rite, which was settled by the Council of Florence under Pope Eugene IV, the Council solemnly defined that the Greeks are to confect the Sacraments of the Eucharist according to their customary rite and therefore, they must use the leavened bread. In the Roman Church they must follow their customary rite of their ritual church, which is the proper rite of the Roman Church."

PARIS (AP) — The rector of Notre Dame Cathedral says the Paris landmark is still so fragile that there’s a “50% chance” the structure might not be entirely saved, because scaffolding installed before this year’s fire is threatening the vaults of the Gothic monument.
Monsignor Patrick Chauvet said restoration work isn’t likely to begin until 2021 — and described his “heartache” at not being able to celebrate Christmas services inside Notre Dame this year, for the first time since the French Revolution.
“Today it is not out of danger,” he told The Associated Press on the sidelines of Christmas Eve midnight Mass in a nearby church. “It will be out of danger when we take out the remaining scaffolding.”
“Today we can say that there is maybe a 50% chance that it will be saved. There is also 50% chance of scaffolding falling onto the three vaults, so as you can see the building is still very fragile,” he said.
The 12th-century cathedral was under renovation at the time of the accidental April fire, which destroyed its roof and collapsed its spire. One of the toughest parts of the cleanup effort is cutting down the 50,000 tubes of old scaffolding that crisscrossed the back of the edifice.
“We need to remove completely the scaffolding in order to make the building safe so in 2021 we will probably start the restoration of the cathedral,” Chauvet said. “Once the scaffolding is removed we need to assess the state of the cathedral, the quantity of stones to be removed and replaced.”
He estimated it would take another three years after that to make it safe enough for people to re-enter the cathedral, but that the full restoration will take longer. President Emmanuel Macron has said he wants it rebuilt by 2024, when Paris hosts the Olympics, but experts have questioned whether that time frame is realistic.
Unable to celebrate Christmas in Notre Dame this year, its congregation, clergy and choir decamped to the Saint-Germain l’Auxerrois Church across from the Louvre Museum instead.
Parishioners at Christmas Eve Mass shared sorrow about the fire, but also a feeling of solidarity.
“I remember my mother told me that she was watching TV, and that there was a fire at Notre Dame. I told her ‘it’s not possible,’ and I took my bike, and when I arrived I was crying,” said Jean-Luc Bodam, a Parisian engineer who used to cross town to attend services at the cathedral.
“We are French, we are going to try to rebuild Notre Dame as it was before, because it is a symbol,” he said.