NIP-70 would be possible if relays adhered to any universal policy, but they don't, so nostr is effectively the aether of the internet.
Maybe it works, maybe it doesn't, but just find a network technician somewhere amongst the public aether sphere, and you can perhaps diagnose your issue and fix it yourself.
I mean there is still an event deletion tools in the clearnet somewhere. Just query deletion of every event individually on every relay. Simple.
There is probably even a mass delete function we could vibe code and pitch for 10k sats per use.
Now we're thinking 🤔