I used old.reddit.com/r/PowerDeleteSuite script. It wasn't great. I had to delete a few pages of left over comments.
Even on older deleted comments from years ago I had people pestering me for professional advice. I wrote a two page essay on ankle sprain including details for every therapy option that I knew of and people would still DM asking for something personalised, even after I deleted the initial post and left the career/industry.
My account was already suspended so unless I was logged in, the user profile came up as banned or something. I'm not too fussed, I was just looking to be done with the place.