Assuming the scenario where a user is basically chased away from major western relays, he can still continue writing new texts with his private key. As long as some relay located somewhere (e.g. China, Panama, Moon, ..) accepts his texts, then others will still be able to read and know it was from that specific person.

There are other ways to censor a person/nostr: 1) Block the whole traffic related to nostr relays at provider level inside a country. 2) Make illegal to use nostr since it is "unregulated communication media". 3) spam the network with hideous/horrible content, and then market the protocal as "darknet" only used by criminals or mentally ill people.

Any of these tactics are used often. The thing about nostr is that texts don't live just on relays and anyone can easily archive them. This means that history by specific users can be kept and safeguarded for the future. That is mostly the reason why I like it so much. We only know detailed history thanks to the records that survived until our days. Any closed platform eventually closes down their data (e.g. reddit, stackoverflow, twitter, etc) but in practice this is the same as denying access to our collective online history. Nostr will survive woketivism or any other *isms.