A post from last month at Mary Victrix: SSPX on the Brink:

It seems, as I have said, that the Holy Father does not favor the position of Gheradini and De Mattei. The doctrinal preamble is non-negotiable. The existence of a hermeneutic of continunity, as such, is not a matter for debate.

Why? What in our understanding of the Magisterium and the status of the conciliar documents requires that we have to interpret them thusly? Giving a charitable interpretation may be required, but is it possible that some of the documents may contain some errors? Isn't that the question? If it is impossible that the documents contain error, then everything must be interpreted in the light of Tradition. But if it is possible... then such an interpretation may go far but it may still not be enough to turn falsehood into truth.