I used a free download called Redact to go through all my comments on June 11 and replace with AI language garbage. I did not delete submissions at this time, however, though that is an option in Redact. This process took almost 4 hours because I had two 11+ year old accounts.
Because I started this late at night and am in a specific time zone, a few of the subs I commented in the most had gone dark (midnight of June 12) and my comments could not be edited on my SFW account. In doing this, I was permabanned from several subreddits on my NSFW account.
Today, I opened Redact again to see if I could alter comments/remove submissions on my account that had the most subs go dark. Redact wouldn't even run for my SFW account so I logged in to reddit directly and saw a message that my account had been deactivated, which is why I think Redact was throwing me errors. I manually deleted all my submissions from both my accounts and manually deleted any comments that were original language from me.
I left up the AI edited comments and then deleted both my accounts.