I used Power Delete Suite but I had to modify it a bit to put in a delay of about 30-45 seconds for each comment as I was editing the text for each one prior to deleting.
Took quite a while, but in the end my account was gone. I’m sure reddit could pull stuff from it if they really wanted, but no user facing options exist - even “deleted reddit comment viewers”.
Edit: I will say that I’m unsure if this still works (or any editing tools) because of the API changes.
Have you tried using:
https://docs.flatpak.org/en/latest/flatpak-command-reference.html#flatpak-repair
There is a
Option to see if there are any issues before committing the changes.