Nothing is stopping you from expressing yourself however you want - just elsewhere, if you can't follow the rules.
fwiw, this very website has its own code of conduct: https://news.ycombinator.com/newsguidelines.html
It focuses on different things than the Wikimedia one, but it's fundamentally the same thing. For both of them, I'd suggest that if there are things that you feel are detrimental, you specifically address them.
Making an empty comment like "new wave of censorship" achieves nothing except saying "I don't like the rules". In which case, fine, there are plenty of other places on the Internet.
From my perspective it's naked entryism, striking at the centralised weakness in an otherwise robust, decentralised system.
And then there's Wikipedias in other languages and other Wikimedia projects, which come with additional cans of worms.
It definitely happens, but the influence and uncivil behaviour by longtime editors are always, in my experience, very well disguised under a veneer of civility and lawyering. So the CoC will be completely useless against that, which is IMO the serious issue with Wikipedia right now.