Giving it a bit of thought, if +Schneider and +Vigano are in good standing with the Church while holding that there are errors in Vatican II, then what is the obstacle for SSPX joining back in full communion with Rome?
Part of the obstacle beforehand had been that the SSPX had to accept all of Vatican II, at least by applying a hermeneutic of continuity. Here we have two bishops in good standing agreeing with them that there are in fact errors in Vatican II (they probably have the same errors in mind that the SSPX does).
So either +Schneider and +Vigano need to get the boot, or else the SSPX needs to be let back in while being allowed to hold that there are errors in V2.