Looks like redditors have discovered that /r/AskSocialists was taken over by the ACP. But then posts criticizing them have been getting deleted in /r/socialism, too, so seems they're also in there. Since /r/thedeprogram was shut down it doesn't seem good for the left on reddit, although at least a bunch of people are aware of the issue now.
"national socialist" is what "Nazi" is short for; the Nazis were, formally, the national socialist German worker's party. Nazbol is short for National Bolshevik, which was a similar and slightly earlier ultranationalist movement in Germany that from what I understand leaned a bit harder into appropriating left wing ideas.
Maga communism is effectively the same thing for modern America - "socialist" right wingers who lean into MAGA stuff to try to appeal to a reactionary base, which (I suspect and hope) is unlikely to get the same traction as the previous ideologies because said reactionary base just isn't as big or radicalized as they think.
Take this with a pinch of salt, I am not American or an expert in either history or politics but this is my understanding.