Cupertino asserts ABL said a state of sedevacante was certainly knowable and that the faithful could act on such a discernment.
Really?
On p. 506 of Bishop Tissier de Mallerais's "Marcel Lefebvre," we read the following:
"Perhaps one day in 30 or 40 years, a meeting of cardinals gathered together by a future pope will study and judge the reign of Paul VI; perhaps they will say that there were things that ought to have been clearly obvious to people at the time, statements of the pope that were clearly against tradition.
"At the moment I prefer to consider the man on the chair of Peter as pope, and if one day we discover for certain that the pope was not the pope, at least I will have done my duty."
Conclusion:
1. ABL clearly believes Sedevacantism is not certainly knowable;
2. It is the therefore laughable to believe he would believe Catholics who buy into Sedevacantism to act on this shaky belief.
So contrary to Cupertino's unfounded assertion that ABL harbored Sedevacantism in principle, we have Bishop Tissier quoting him 2 sentences later, expressing how doubtful he felt the sedevacantist thesis to be, and instead preferring:
"I prefer to start from this principle: we have to defend our Faith; in that there is no shadow of doubt concerning our duty."