You are not deleting your account, only to return with a new account. Reddit has become a cesspool and it would be a wise decision to leave with all your data.
You may corrupt your data before leaving so it overwrites the backup. Someone used an auto app that replaced all their posts with random gibberish. It took about a week, this is something you might explore if it addresses your concerns.
"some" not all. Use it for the ones that work. For the ones that do not allow, you may manually delete your comments or replace them with random single words so it overwrites whatever backups they have.
In a war of man vs machine, Man always wins