The evidence I’ve seen is compiled mainly in these posts:
https://raddle.me/f/lobby/88428/so-the-dengist-who-made-lemmy-has-announced-raddle-isn-t-an https://raddle.me/wiki/why_raddle https://raddle.me/wiki/history https://raddle.me/wiki/QnA_with_Emma
https://www.vice.com/en/article/zm3wbj/radical-leftists-built-their-own-reddit-after-it-banned-them
I have to hope that main instances will stop federating Lemmygrad at some point. There’s no place, IMO, for genocide denial/affirmation and authoritarian extremism on platforms like these. Or any platforms.
Edit: Seems this is unfortunately unlikely as the lemmy.ml instance appears to be moderated by a genocide denier and authoritarian.