I just think what he says is a false statement from the very beginning. Nobody has ever claimed Nostr is private and everything we say here is extremely private. Idk where he saw claims like that but I haven’t seen a single Nostr dev saying something like that. The core property of Nostr has always been its censorship resistance. You have to physically shut down a large fraction of relays spread all over the world to disturb the network.
The privacy will come later. There’s talks going on between Nostr and SimpleX devs to integrate their encryption protocol as Nostr DMs.