.
Ideally, if Vigano responded, he would point out exactly what you have here: that the Archbishop was no committed enemy of sedevacantism.
Isn’t it a little absurd to expect Vigano to presume to correct SSPXers and Resistance clergy and bishops on Lefebvre’s position on sedevacantism?
Should Vigano need to look any further than the official policy in place for the last 40 years, which precludes sedevacantism ad infra?
In any case, we may know soon enough, since I emailed Vigano Bishop Thomas Aquinas’s letter.