If it's a Magisterial Docuмent. Isn't that what's at issue here? It was said to be merely pastoral, yet the actual docuмents say something entirely different. The council was meant to be confusing because that's how modernists proceed
I think you're trying to disprove sedvacantism instead of dealing with the reality of what Vatican II actually did and what the drafters of the docuмents actually meant.
In order to prove a docuмent purporting to be (and by all appearances so being) Magisterial to not in fact be so, the standards are higher than examining a random work and deciding what censure it would merit. Would you disagree? Saying it contains only errors though not heresies appears to me insufficient from the sedevacantist point of view.
From the non-sedevacantist point of view, the authentic Magisterium only requires an altogether prudential and conditional assent, as I quoted a source to prove, and in which the possibility of error is not altogether and absolutely excluded.