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It's a classic tactic of his, and some users here who seem to be his disciples, to defend their beliefs by accusing others of believing the same. Here's a typical scenario you'll often see on Cathinfo: A sedevacantist says if you believe Paul VI was the true Pope then you cannot condemn the Mass he promulgated as impious and unholy, an R&R replies "then why don't you go to NO masses!", completely ignoring that the sedevacantist doesn't share his belief that Paul VI was Pope. I've seen that exact same scenario play out dozens of times. I'm not saying that there aren't valid counter-arguments about the claim the sedevacantist character made in that scenario, but instead of those actual points we usually just get fallacies, like the one I described above, and trying to point out the fallacy just leads to the entire topic getting derailed.

Almost makes me wonder if it's an intentional tactic to dodge the issue.

For some.  For others?  I believe intentional and of bad will.

I was the one who posted on SD about starting up Archbishop Lefebvre's canonization process. There was some opposition, hardly unexpected, but also some support, and there is a prayer thread dedicated almost exclusively for it. There's also an ongoing Rosary crusade where we've come to 2800+ Rosaries. Archbishop Lefebvre will be recognized as a Saint one day. I wish those who had that conviction would already begin asking his intercession. Recently, Archbishop Sheen's beatification process began with a reported miracle.

Why? Because many, many people were asking for his intercession. So in one case, God answered. I wish all would do the same for +ABL.

As for canonization, is it infallible? The question is nuanced. Does the Pope say the person canonized is in heaven? Yes, most definitely. Anything necessarily more than that? The Papal canonization decree only says that the person is in heaven and is to venerated by all.