This priest has done nothing wrong.
Therefore no other person, even if he be a priest, may add, remove, or change anything in the liturgy on his own authority. Sacrosanctum Concilium no. 22.3
While the Priest proclaims the Eucharistic Prayer “there should be no other prayers or singing, and the organ or other musical instruments should be silent”, except for the people’s acclamations that have been duly approved, as described below. Redemptonis Sacramentum, no. 53
Adam Wood, who writes above, "I don't understand what is going on in this video," has, in fact, quite publicly proclaimed his theologoical liberalism.
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