I have a great amount of respect for you and what you have done for Nostr. I hope I’m wrong. I wish nothing but good for you and the network. But Fiatjaf did submit a grant proposal to DDoS Monero and replied he may be behind the attack
Free R&D - If it is fiatjaf, and he succeeds, that means a single person or small group can DDoS Monero, so it doesn't stand a chance against any serious threats anyway. It's better to know sooner than later and find weak spots. If he doesn't succeed we gain valuable insight too. I've already seen several great ideas for mitigating this floating in different spaces. So let's see what happens.