Nah. You really can't delete a post. Even with the 'delete request' nip, there's enough relays on the network that archive every note posted by everyone, which means there will always be a copy of everything you post available to everyone, forever. No matter how many times you mash that delete button, your notes won't get deleted by every relay.
Discussion
It is a good reason to always the a moment of pause before posting anything. Free speech is great, but words still have consequences and Nostr has a kind of permanence that even the broader web doesn't have.