Would you always equate an act of disobedience to the pope, regardless of the circumstance, with breaking away with him?
(Oh, and this might be helpful: I agree more than disagree with the majority of SSPX's claims. The difference is that I'm still in a place where I can hopefully, in my own small way, move things forward in a positive direction. The FSSP is still in, fighting the good fight. But SSPX? DQ'd themselves on the self-own.)