How would you delete an account in a protocol that whole purpose is censorship resistance? It's the same as asking to block a bitcoin transactions.
Discussion
You can signal to relays right ?!
Relays don't have to comply. I can run my relay and broadcast your notes all over again. That's why you can ask relays to delete a note but it's hard to effectively have it deleted because your note can be on hundred of relays, that's the point of the protocol, not being able to censor your notes, even if it's you who wants to censor it with a delete.