They have an edit history for every piece of content on the site. All you’ve done is post a giant flagpole on all your content stating “this account was previously owned by a real live human” and increased the value of those comments for AI scraping. Unfortunately your protest has done nothing but help them.
The best way to stick it to reddit these days is to not interact with it at all. Don’t add to their data store, don’t give them traffic, don’t click on them in search results. Don’t protest-edit your content because you’re just helping them separate wheat from chaff.