Matthew, you're familiar with the fallacy known as "No True Scotsman?"
That's kind of what this whole thing amounts to. When you use a proper noun "The Resistance" people expect (rightfully) to find some tangible, discernible, and evidence based organism. In other words, they expect to find a group. A group, at least in the loosest sense, is a collection of persons who report to a similar head and act to achieve a particular goal.
But what is being described is NOT a group. It's a list of traditional Catholic priests who are not members of the SSPX. How Fr. Trinchard is mentioned, I have no idea. He is not only passed recently (RIP) but, to my knowledge, was never involved in "The Resistance" at all. Maybe I'm wrong about that.
Anyways, if you just forget about "The Resistance" and focus on "The Catholic Church", things become a lot less confusing. It's no surprise that people want nothing to do with "The Resistance." They mention it to someone from Pfeifferville and learn that it is proper only to Pfeifferville. They mention it on CathInfo and they're given a list of priests who aren't associated with one another in any meaningful, organizational sense and told that this list is "The Resistance." They mention it in South America and we're not entirely sure what it is, just sure that it has nothing to do with Bishop Williamson. Pretty soon "The Resistance" just becomes the annoying, cliche term by which a particular former-SSPX attendee identifies his "new group." Whether or not it's actually a group proper.
Decades of loyalty to the SSPX as an organization have left people feeling lost without a named group. Whether they call it SSPX-MC, The Resistance, SSPX-SO or something else. Truth is, none of these groups are the Catholic Church. Focus on belonging to that, the rest will follow (and appear more or less inconsequential).
And I know that no one *said* the SSPX or The Resistance or something else is the Church. But it's easy to get that impression when these named groups are given so much focus and attention. And I think the proof is in the pudding, when you see the kind of wounded affect and teetering faith of those who've been exposed to the scandals of particular groups. It scandalizes them against the faith as such, because they conflate their particular group or their particular priest with the Church itself.