I saw that "api usage audit" message too a few days ago! didn't screenshot and then it was gone. and nobody talked about it anywhere on reddit even though it's new official comments from the admins, like wtf
Over the course of days/week(s), you should slowly edit all of your old comments and posts into gibberish, and mark your posts as NSFW. Later, slowly start deleting posts/comments so that you won't be a target of their rollbacks.
I read somewhere that instead of deleting your account, it's better to ghost it or scrub your posts from the site. I'm a 12 yr acct so I want to make the best choice.