I used Power Delete Suite (javascript IIRC, via Firefox, year ago) to edit and delete, and mine are still gone. Not sure if it is still effective.
Reddit is probably less and less tolerant about edits and deletions, now that they’re full speed on selling our data. Still see plenty of deleted posts when I’m searching for things, which is… nice I guess (bittersweet).
At least MS account may be slightly more useful (OS, software, school, work). There is literally no reason to have PSN account except a few exclusive games on PlayStation. Even worse are smaller game devs and pubs nagging for accounts.
Of course there is no great reason offline/SP/old games should require an account to play, and out of principle “nope” should be considered. But almost every goddamn thing requires an account these days. At least we have decent password managers now…