If you can censor the catalogs you can censor the relays. Not least because the protocols allows the relays to serve up catalogs of name to pubkey mappings. Having this lookup functionality makes no difference at all to the ability to censor. If you have an issue with the censorship resistance of this you have an issue with the core concept of this project.

That's fine. But it's entirely independent of whether or not you provide a lookup mechanism for names.