A profound question, indeed:
“On the other hand, could you name me one case in the history of the Church in which an Ecuмenical Council was deliberately formulated in an equivocal manner so that what it taught in its official acts was then subverted and contradicted in practice?”
He seems to be implying here that which he has questioned previously:
Was Vatican II really a legitimate ecuмenical council of the Church?
To Vigano will go the credit for providing the roadmap for a future pope to declare this “council” null.