Ok I think I understand now. Simply because it was standard boilerplate rhetoric you can take it upon yourself to dismiss the teachings of a Pope and a Saint. Very convenient. Is there now a fifth condition for a Pope to be speaking ex cathedra: It would probably read as follows: Do youu think I was the one that promulgated a restored order of the Mass? It was Pope Paul VI.
BTW, your error is in thinking a Pope can circumscribe the Supreme Power of a future Pope in matters that are not Dogmatic. Please re Mediator Dei and see the Pope has ALWAYS had the power to change the Liturgy.
Or, maybe you don't accept the author of Mediator Dei as a legitimate Pope, who knows...
Wrong again. Pope Paul VI, in the opinion of many of the best scholars, did not have the authority to impose a new liturgy. A pope cannot innovate, he can only pass on what he has received. This may be why the old Mass was never officially abrogated and why the new Mass was never officially promulgated. No papal authority can fabricate a liturgy.