Well, it's time for Fr. Pfeiffer to make a choice.
There are only 3 choices.
A) Apologize to Fr. Zendejas, or at least stop persecuting his apostolate. He needs to tell his followers that Fr. Zendejas and Fr. Garcia are Resistance priests in good standing, and their Masses as just as good as the ones he/Fr. Hewko/Fr. Voigt can fly in and offer. He should cancel the standing "boycott" or red-light on these two priests, whose steadfastness in the Faith has now been personally vouched for in no uncertain terms by +W.
Some light criticism or disagreement is a different story. Priests will often disagree on different matters of prudence, priorities, etc. But advising the faithful to boycott other priests' Masses? That crosses the line.
B) Stop the public deception and come clean to the Traditional Catholic world that he is AT WAR with Bishop W, and that he works in full opposition to the good bishop. Actually, Fr. Pfeiffer must vocally denounce +W as dangerous to the Faith, since the latter publicly endorses 2 priests "dangerous in doctrine". At least then the Faithful could make a clear, well-informed choice about who they will choose to follow and support.
C) Continue to operate in this grey area, persecuting the two priests (perhaps +W as well?) when no one is looking, but giving the general impression to the world that he is "buddy buddy" with the good Bishop -- after all, no one has more Resistance "street cred" than +W. Or more actual power -- who else can consecrate bishops or ordain priests for Resistance seminaries?
I literally pray to God that he doesn't choose C. But if, God forbid, he does -- I will not be silent.
P.S. Fr. Pfeiffer is the head of his Boston, KY operation. He gets to choose his organization's "official" position. But I call on all the priests that work with him to do the right thing. Don't oppose the original faithful Bishop of the Resistance! (What? Bishop Faure you say? Well, who consecrated him? Again, we come back to +W being the faithful bishop of the Resistance)