[xmdx]

Even that won't work because there are companies like Pushshift (I think it's pushshift anyway) that are constantly archiving comments, so they have the old comment and the overwritten one. I think you can request pushshift delete your data under GDPR so at least you can remove your data from there, but I believe they are not the only ones doing this.

[ghglkl]

Pushshift only blocked such data from being queried via their API. All these users' posts and comments are still in their data dumps, which now have tens of thousands of copies after being released as torrents.

[melech_ric]

Seems like a game of whack-a-mole. A person might get Reddit and Pushshift to delete their comments, but surely there are other less well-known companies mirroring Reddit. Maybe even clandestinely.