I think that makes it a little rash for non-theologians to make definitive judgments about certain validity or non. Only the Magisterium can do that, or so it appears to me.
Let us not forget that when the New Mass was foisted upon us in 1969 there was a great multitude of "theologians" with their pre-Vatican II diplomas, who told us
stupidos not to worry about the New Mass. Just trust the theologians! Fr Wathen always told us about these brilliant "theologians" who found absolutely no problem with The Great Sacrilege.