Something which "contradicts the testimony of Sacred Scripture and the voice of Tradition, as well as the Catholic Magisterium" is a major problem in an ecuмenical council approved by a pope, as I, Lad and others here have noted.
Of course, I agree the error in V2 is a major problem. You keep pointing to the fact that +Vigano admits that V2 contradicted Scripture, Tradition and the Magisterium. So what? All of us have known this for 60 years. Many new-rome officials have already admitted this. The question is, does V2's level of authority/teaching constitute binding, infallible doctrine? No, it doesn't.
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V2 was the ultimate sleight-of-hand magic trick, performed by the soldiers of satan, who is the ultimate magician, because all he does is fake and only appears real. It appeared to "teach" doctrine, but it only "proposed" doctrinal deviations; it appeared to be binding in nature, but now we know that it was only offering "pastoral" theories, which still to this day require continued interpretations and explanations.
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That which is not binding with a "certainty of faith" cannot be doctrine.
That which is not doctrine, cannot be infallible.
That which is not infallible, can err.
That which can err, is not indefectible.
A council, even with papal approval, is only infallible and indefectible, when it proposes with "certainty" some doctrine/teaching, and binds the faithful.
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Paul VI's approval was legal only. How can one theologically approve of ambiguous, contradictory, doctrinally theoretical docuмents, which deviate from orthodoxy, and require continued interpretations? How can such incoherency be binding on the faithful, for how can one "accept" both A and not-A at the same time? The essence of V2 is contradictions, both of Tradition and of itself. Just as the new mass was only legally approved in creation, but is not binding on anyone to attend, so V2 was legally approved as an official ecuмenical meeting/council, but it did not write anything reasonable enough to even make sense, much less "assent to". Appearances can be deceiving, and the false, V2 parallel church is all appearance and no reality.