They’re definitely keeping all the old comments, even if you “delete” them. What an edit is doing is making a new version of a comment. While this seems strange, it’s literally easier to do on a technical level and provides a layer of safety if there’s a bug in the code (allows recovery to previous data).

Honestly, this seems like a good move from Reddit. If they believe they’re removing a bad actor by a ban, then of course they’re going to prevent a bad actor from interacting on their stuff. Allowing edits post-ban for abuse is not a good outcome.

Don’t like it? Angry at Reddit? Leave and never interact with them again. Pulling that bandage off will sting but you’ll be better off for it.