This.
Some individual priests might be "good", and there are valid Masses and graces there. but the SSPX as an organization, in the abstract, is dung.
Yes, of these individual priests, I imagine some had been ordained by Bishop Williamson and others have Resistance and anti-agreement inclinations.
So, the bottom line that I hinted at earlier is that there are in fact many priests in SSPX that are sympathetic to Resistance. There are of course also those who are brainwashed cradle-Trads having grown up in the +Fellay neo-SSPX and it's clear that only +Fellay yes-men get ordained, much less promoted to positions of leadership. So apart from those types, the old-school priests stick around, alas, for one reason. And it's a sad one. They stay around because the SSPX gives them security ... financial security, a guaranteed ministry/apostolates, medical insurance, etc. Sadly, that is the bottom line. So they'll convince themselves that, well, as long as SSPX are not "red light", i.e. don't go open Modernist or open heresy, then they talk themselves into believing it's OK to stay. So while they try to edge themselves toward the periphery of the cauldron, they're also getting the frog-boiling treatment as they become more and more desensitized to the growing Modernism in SSPX.
So, I'm not just speculating here either. I've talked to a few of the old school priests that I went to seminary with. They're sympathetic with Resistance but very clearly are just too afraid to leave, where they wouldn't know what to do and feel they'd just end up homeless.
Sadly, I'm convinced that it's also the reason for Bishop Tissier's about-face and ultimate compromise.
It's very likely that it's only on account of these types that +Fellay / Bergoglio haven't already created an official, formal, public deal ... YET. It's because such a deal might create the red light that would finally get these types to leave. So they're waiting until those moves that would have been red lights 10 years ago, by a process of gradual acclimatization (frog boiling) are now only yellow-light. AND most of those priests are getting up there in years, close to retirement age ... so what would happen to them?
That's one of the major reasons I do wish His Excellency Bishop Williamson, God rest his soul, would in fact have created a formal organization, since it perhaps could have given a sense of stability to some of those priests who were fearful of leaving for those reasons. But they would likely have taken decades to build up to the size of the SSPX organization, given they were rivals, and given the influx of cash from Krah et al. ... they could never compete with the organization building 50-million-dollar seminaries and 25-million-dollar churches.
And between the Fellay-brainwashed-yes-men among the newly ordained priests, the old school ones getting older, dying off, or just too afraid to leave, and the mass influx of Motarians after Bergoglio shut down most of the Motu Masses, SSPX will have gone full Modernist within about 10 years or so as this trends continue.

I kept wondering why Bergoglio shut down the Motu Masses because some percentage of them would go to SSPX rather than go back to the Conciliar Church, but he shrewdly realized that these lay people would actually change the "culture" at SSPX chapels to being liberal, Modernist, and even to the Left of FSSP churches from everything I'm seeing. Then, because SSPX have buried themselves in debt over their eyeballs with these absurdly-imprudent building projects, they can't afford to drive away any of these ex-Motarians, which means that they can't be hard anti-Modernist and anti-Bergoglio, since that would scare them off to find such a "schismatic mentality" there.
It's been masterfully worked out by Bergoglio and +Fellay. Bergoglio (or at least his handlers) are not nearly as stupid as Bergoglio seems (well, as he actually is). So Bergoglio allowed the SSPX to remain un-condemned, to continue to have jurisdiction for Confessions, etc. so that the Motarians could be convince that it's not a terribly bad thing to go SSPX, and when they get there they feel right at home with non-condemnations of Bergoglio and the Conciliar Church. This way Bergoglio doesn't have to give approval to Tradition, which he hates, and if he did so after shutting down Motus, everybody would realize he's full of crap and that he's up to something. At the same time he wants to give them enough to make Motarians comfortable enough to go there and wreck the climate at those chapels until they might as well just go Conciliar.
Probably within 10 years it'll be as St. Jerome said about Arianism, to paraphrase, "the SSPX will awaken with a groan and find themselves Conciliar Modernists".
Between this sinister plot, their allowing the obvious infiltrator that was obvious, Huonder in there "consecrating" holy oils, and probably ... had God not intervened ... "ordaining" priests, and then +Fellay's inexplicable coverups of some admittted and proven perverts and child rapists ... I'm convinced that he's either a total infiltrator or that he's been compromised --- could it be by the same vices he himself is covering up (I find his smile to be very creepy). There's no other rational explanation for what he's been doing.