You can't deconstruct Vatican II and read it sentence by sentence, but it must be viewed as a whole. This is like saying I have a book by some Eastern Orthodox or Protestant that might be 90% OK. What's important is that even the statements that happen to be materially true are now put into the new "context". Why else does V2 have to re-state prior Church teaching? It's because it's putting prior Church teaching into the context of the new mentality and the new Modernist-subjectivist mindset. It's one thing to say that "There are Three Divine Persons in One God" and present it as required for belief, and another thing to say that [it happens to be our view that] "There are three Divine Persons in One God". In both cases, the statement is true, but in the former you're presenting its "theological note", so to speak, as a dogma that's objectively required for belief and for salvation, but in the latter you're presenting it as, "this in our opinion is the fullness of truth, but it's OK for you to also not believe this, as we respect Muslims, Jєωs, etc." It's one thing to present a dogma as objectively true and another to present it as closest to the truth but still evolving toward greater trueness (ala de Chardin and the other Modernists).
What's at issue isn't the material truth or falsehood of statements that you can sit down and run math on. What's at issue is the entire theological context or framework in which the truths are presented.
So, going back to my analogy with a Prot. Prot might say, "Yes, there are Three Persons in One God." Materially correct. Problem is that the Prot holds this to be true because he derived it from Sacred Scripture using his private judgment, and his formal motive is completely flawed. So materially correct, but formally incorrect. Same thing with Vatican II. Statements that may be materially correct are rendered formally incorrect due to the warped subjectivist/Modernist formal motive of belief. In both the case of the Prot and of Vatican II, the REASON we believe these things is different than the Traditional Catholic view.
In the Vatican II perspective on the Holy Trinity, it's what we happen to hold true, but if you don't accept it, it doesn't mean that your beliefs are not true also. It's a question of degress of truth and relative trueness. Ours is more relatively true than yours, but this doesn't mean that your beliefs are untrue. Ours are just MORE true than yours are. THIS is is why Traditional Catholic truths are restated materially, so that they can be respun in the new subjectivist/Modernist context.
Vatican II admitted as much, claiming that they were not teaching anything "new" but presenting it in a "new way". This mode of presentation, the subjectivist/Modernist mode of presentation, pollutes the entirety of Catholic doctrine.
This is very solidly established Catholic doctrine. It's not necessary simply to MATERIALLY adhere to true propositions, but the FORMAL MOTIVE of belief has to be correct and true. I can't believe in the Holy Trinity because I discerned it from Sacred Scripture. I must believe in the Holy Trinity due to the formal motive of the Church having taught it. This is the reason for the teaching that if you deny one dogma you deny them all. You could accept 99.9% of Catholic dogma ... or, as +Fellay says of V2, 95% of Catholic dogma ... but if you reject just ONE of 1,000 dogmas, you reject them all. Why? Because you do not have the correct formal motive for the remaining 95% or 99.9%. So the formal pollution of Vatican II renders all of Vatican II untrue.