I found a plug-in for Firefox that deletes all posts and comments from your reddit account. (Power Delete Suite). Now I am in talks with reddit, to have them delete my account and data.
They say that all content will be disassociated when I delete my account but I had them confirm that they won’t recreate it when I have deleted it. They still say that they will retain the IP used for creating the account. Not sure if this is legitimate data redemption after I have asked for my data to be deleted according to GDPR?
I don’t think it is because the comments got restored but because the reddit profile can only display something like a 1000 comments, and scripts like power delete suite can only delete what the profile shows.
For the rest you’ll need to request GDPR file and the check each comment link provided to delete the ones the scripts weren’t able to delete.