Code of Conduct cannot stop someone from doing something.
It’s just a document.
However, in this case, the presence of the code of conduct has made it trivially easy to point out the language as wrong in a way whoever wrote this for Zig cannot refute.
It’s working exactly as it should.
Which suffice to say is not at all
They don't have to refute it; they have the power to ignore it.
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How is it working? The post is still there, referring to people as "losers" and "monkeys". Was the author of the post chastised? Have they edited the post and apologized?