Marcan is an injured party! If you go to great lengths to build a legally clean open-source project on top of a foundation of supposedly legally clean open-source libraries — absolutely critical libraries that have no currently existing alternative — and then discover that their supposed cleanness was a lie all along, it's not just an abstract insult and betrayal, it's a realisation that the immature actions of others have put an entire scene in legal jeopardy.

It seems to me that he very visibly took an L, and he is still tilted by that. This is also after a wave of harassment from the far right.

Please forgive me for being old, but what the hell does "took an L" mean?

It means to take a loss, as opposed to a W which is a win.