It’s “illicit” if he’s not following the prescribed text, but it’s still “valid” if he does the Consecration correctly, with “This is my body, This is my blood.” If he changes those words, it’s “invalid,” and there’s no transubstantiation, only bread and wine.
I understood that it was the entire new translation that had to be said word by word.
At least that was my thought after listening to one of the priests from Mount Angel who assisted with the new translation, making it more like the Latin.