(1) that Parler was deplatformed because planning for the Capitol attack took place on the platform, (taking your best swing, you've managed to find an article presenting the incitement—not planning—cause for deplatforming as being specifically about incitement for the Capitol attack.)

(2) Planning for the Capitol attack took place exclusively on Parler, (the closest you got to this was the claim that Parler was a “preferred” app for planning for extremist groups, not that it was the exclusive venue for planning the attack)

Again, I don’t really understand your argument here. This is something that you often see on HN. People going deep into the woods, disputing minutiae while avoiding the entire point of the thread because there is no argument to be had. Combined with the upvote/downvote system, it’s an effective tactic. It silences opinions you disagree with by pushing them deep into threads where few will read them. But it is destructive to our community and makes debate on here absolutely pointless.

There is hypocrisy in the Parler situation, and it is disingenuous to say otherwise. Planning of attacks and general violence advocacy, from both the left and the right, occur daily on Facebook, just as it may have in the darker corners of Parler. The only difference is that Facebook is still operating, and Parler is not.