I’d be interested to see what Fr. Z has to say about Rome turning a blind eye towards the validity of the countless confessions (heard by) and marriages (witnessed) by the priests of Bishop de Castro Mayer, after Bishop Castro Mayer was supposedly “excommunicated”, along with Archbishop Lefebvre and his four bishops, before Bishop Rifan finally smoked the peace pipe and inhaled the “spirit of the Council”.
As was said earlier - validity of the sacraments doesn’t hinge on the predisposition of the individual priest. That still doesn’t absolve Fellay et al of their decision to defy the Pope.