Purge deletes everything, including the fact that you've deleted them and they become searchable again. It's like a complete reset. Even the act of removing them is reset
You can purge, and then bring it up again and then remove if you want to delete any cached media or posts.
You can also remove specific remote communities, which bans them from your site instead of the entire remote instance. Make sure to use remove, not purge.
The community will not appear in the list nor be searchable.
I'd be more inclined to reach out to Louis Rossmann, especially since he's said he won't post on reddit anymore. Maybe we can even find a home on lemmy for his right to repair campaign.
Do you need energy? So there's something called the pineapple diet (please ask your doctor first) where you eat pineapple for three days to lose weight. Biggest problem here is the spam, so I guess you'd have to use some sort of food that can be rehydrated like soylent.