I think you misunderstood him. Only people using that app would not see your notes.
Public on nostr is in fact public. Much like real life.
What about the nodes?
nostr:nevent1qqsq29hlat5w99p4xwcmwu0ws5ldfucnvp0wtvlcst06me5kyy7zwhcpz3mhxue69uhhyetvv9ujuerpd46hxtnfdupzqcgxv5zxzlh8jwrsy8scez0m08gam0p700l3nneznr6qgehcw90fqvzqqqqqqy8skm66
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If you’re that interested in “safety”and censorship, perhaps nostr isn’t for you.
Maybe, or you can develop a standard for opt-in messages that are end-to-end encrypted to the list of people you want able to read them. Or something that scales a bit less terribly.