Your user profile on reddit may not show any comments anymore but that doesn’t mean they’re all gone. If you want to purge your content, use the search engine of your preference to look for your username. I just spent four hours manually deleting a bunch of stuff that didn’t show up on my profile and that any automated solutions were unable to find during the last few weeks (not just because of blackouts). I’d be surprised if I won’t have to do this several times more.
Also, if you’re using Qwant, remember to go through all the languages.
Can confirm: I’ve spent a week manually deleting everything I could until I got the “this user hasn’t posted anything” message two days in a row, but shreddit found 981 (not a typo!) more comments to delete that reddit chose to not show me for whatever reason. And there are STILL a couple of comments I am able to google, but I am no longer able to delete them as I nuked the account in the meantime.