As of... last year, I think it was hardfork 20, a user can edit their post on steem as often as they like, and in practice that means the owner of the post can delete the contents of the post. Likewise a frontend can opt to not show a users posts. However, neither of these actions remove the post from the chain.
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But editing posts does not delete the old posts. The front end show the edited post, but the old one is still on chain you just need to find it. (For example on steemd)