That all is true, and it's also true that while these banned people can set up accounts on other clients that use other relays and other app views they'd then be invisible to 99% of protocol users.

Zooming out though, these Mississipi-esque State laws are written to catch out anyone running any relevant infrastructure, including Nostr relays, Nostr clients, blossom servers, and whatever else. So all that can really be said is that Nostr tech makes it easier for Nostr tech operators to flout these laws.