It's not true. There isn't a single piece of evidence of censorship resistance.
You might as well claim that rsync is resistant to censorship. Since no one has tested it, it must be true.
Discussion
Relays are servers, so relays are at least as resistent as any other self-hosted server. Which is quite resistent.
By that logic, the entire internet is resistant to censorship, but that’s not true. Authorities hide and delete vast amounts of information, and LLMs, which lie, are replacing traditional search.
Yes, but the Internet is much more censorship-resistant than what came before it. It's a progession, with no claim to perfection.
Arguably the best and briefest description of our current incarnation of the web.
I'm not going to argue this point because (1) I didn't understand the OP and I thought his post was accidentally missing context, so I thought my reply would be funny and not starting a debate and (2) you know what I mean.