Behold, the Media Matters report that was attributed as the source in the CNN article.

I understand wanting to know what evidence someone has for an argument, but when the source is attributed in the posted article then demands for proof come across as sealioning which is very much discouraged on Beehaw.

For those that don't feel like reading that Media Matters report, the account in question was openly and explicitly neo-nazi, and Media Matters has screenshots of a number of posts with memes praising Hitler, Holocaust denial, and "great replacement" memes. There's also a meme that just says "It's okay to be a national socialist" which seems about as pro-Nazi as something could possibly get.