Mojang won't authenticate your account to the server. They can't remove the censorship without turning into a server that allows prirated accounts to connect.
Last time I played I'm pretty sure they had a plugin that disabled sending chats to Mojang but left all other checks intact. It just broke the griefing-by-reporting functionality.
Of course that won't save you if you go to servers that don't have reporting disabled so careful where you play.
[dead]
https://modrinth.com/mod/no-chat-reports
Basically with each chat message there's a cryptographic payload proving that you are the sender, so reports can't be fabricated.
If you remove it on the server before sending it to other players (or remove it on your client before sending it to the server) you can't report the messages.
Also look into this and this for exploits:
https://github.com/nodusclient/gaslight
https://github.com/nodusclient/guardian