A few days ago I deleted all of my posts and comments from reddit, but today they somehow reappeared.
I don’t know if that’s a bug or the admins themselves are restoring content, but I’m sure they’d have incentives to do so considering that they make money from your content, whether that is from generated clicks to the website or from selling those data to other companies to train AI models.
Instead of deleting the comments try editing them to some standard text, then go back and edit them all again to some slightly different boilerplate, etc. etc. I wonder if that might overwhelm their saved cache of your comments…