The problem is, CIA, that not everyone shares your opinion of Mr Salza.
Many see him to be a convert Freemason and a learned and trustworthy authority on the Pope and the Faith.
His influence may be quite considerable.
So when he promotes false information about such an important person as Archbishop Lefebvre, and such an important issue as the New Mass, we should not "ignore" him, but vigorously defend the truth, and the honour of our beloved Archbishop. This is certainly focusing on the defence of the Faith.
Absurd. We absolutely should ignore Salza. He has no influence other than with those who are already inclined to consider the SSPX to be schismatic. They're high-fiving Salza and patting him on the back for promoting the position they already held, but Salza is not persuading anyone with his absurd position other than those who already believed it. He's preaching to a new choir now, that's all.
I've never heard anyone who decided, "I'm leaving SSPX because, you know, that Slaza guy is making a compelling case."
Besides that, what +Lefebvre did or did not do in 1969/1970 is of absolutely no consequence. And to play into Salza's tactic is to dignify a non-argument to be some kind of argument that has weight. When people get all defensive and flustered about it, you're doing nothing but dignifying that nonsense.
You can simply put it to bed with saying, "Whatever he did or did not do in 1969 and/or 1970 is of no consequence to what he did and said and thought later". Similarly, what he did, said, and thought in the early 1980s has nothing to do with how he ended up, despite the fact that the +Fellay-ite SSPXers tried to pretend that it did by repeatedly citing him from the early 1980s when he was more conciliatory. This was before he knew enough about Wojtyla to know which way he would go. Wojtyla initially put out signals of his being favorable to Tradition, but then by the time Assisi came around, +Lefebvre realized that this man was as much of a flaming Modernist as Montini had been.
You could easily turn this around on Salza by citing his many years of being a mouthpiece for SSPX, and he'd have no choice but to slink away with his tail betwee his legs if he tries that nonsense again.