The official rite of Mass promulgated by the Holy See for the universal Church (Latin* editio typica*) is protected by the Church’s indefectibility. IOW, it contains nothing that is intrinsically harmful to the faithful, has no heresy in it, and it is most certainly valid. To say otherwise would violate the Church’s divine constitution as set out by Our Lord. The Church is indefectible, and if she promulgated invalid sacramental rites, she would fail to fulfill her mission of providing the sacramental means of sanctifying the People of God. That would mean Our Lord lied when he said, “The gates of Hell will not prevail.” That would mean he wasn’t God.
The English version of the Missal does not fall under this guarantee because it is not universally imposed. There may be errors in translation and, as is the case with the outgoing translation of Mass, may contain passages that are theologically problematic. But that is because they are poor translations and the translators did not do their job.
It is not a matter of “infallibility” because a rite of Mass is not a “teaching on faith or morals.” It is a matter of
indefectibility. The Church would be denying her very essence.