[Maximilian]

According to the sedevacantists, Vatican II directly contradicted previous Church doctrine. Am I to understand that you agree with that/their position?

I don't see any connection with the point I made which was that the Roman Rite was guaranteed to all Catholics in perpetuity. Nothing to do with Vatican II, at least not for those who claim that Vatican II did not intend the New Mass.

As far as your question, however, clearly Vatican II contradicted previous Church doctrine in any number of areas.

[ninenot]

the Roman Rite was guaranteed to all Catholics in perpetuity.

Yup.

Now it's called the Novus Ordo.

Frankly, I prefer the Tridentine as a matter of taste, but NOT of doctrine.

Let's hope you don't confuse taste and doctrine...