No he doesn’t have a point. clients are not centralized by definition. Clients are just code that talk to relays. You can’t censor code/information.
You do not need an app to access Nostr. An internet browser is sufficient. Or if you have an android based phone you can load an apk yourself uncensorably. People are locked in the iPhone mindset to think the only option is an app from the AppStore, this is not true. There are other options.