You can delete notes in nostr. What you can’t do is force relays to honor the delete request. That’s actually the same thing as what happens on centralized cloud services which just hide content when you “delete”.
Discussion
What I’m wondering is, are we all thinking our notes are going to last forever on someone’s relay (regardless if we ‘delete’ or not), when in reality our notes will likely disappear as people shut down nodes or ‘free space’ to reduce costs on their relays?