Did you delete them outright or modify the text and then delete it? That is the tinfoil hat way! If you lived in Europe you could request your data to be deleted. You can also request your data and they are supposed to comply at some point. If you did that you could see what they have.
The rabbit hole will drive you a little bonkers so maybe don’t overthink it for now and take a look at www.reveddit.com and archive.org to see if your username pops up.