Deleting a post is simply marking a piece of text so nobody sees it, but I think the text is still stored in their servers.
Furthermore, a large company like reddit, must backup regularly, meaning there must be several copies of my posts in several SSDs. If the backup once a day… some of my posts are 5 years old.
Companies exist to make money. I suspect they just marked my posts not to be readable by anyone, except staff and they can still monetize them.
Am I wearing a tinfoil hat way too often?
I put in quotes about spez and greed and let it fly.
Edit: Oh and I did not delete my account (I had many) because I wanted to circle back to see what they restored. Only a handful ever were. I hand-edited them with more derision and left them.