Technically on traditional social media you’re still requesting it to be deleted, you’re trusting them to actually delete it and not just hide it from view. If you’re worried about it too much then you could always post to your own relay and that relay alone, then you would have full control over the content on that’s posted. But that doesn’t mean someone can’t import it from your relay. Similar to how people can screenshot on Facebook and save it forever. There really is no escape to the foreverness of something posted online that needs redacted later.