It is certainly not censorship at all. Calling it censorship muddies the waters and plays right into the hands of the people who want to push hate speech.
Censorship is the suppression of speech, public communication, or other information, on the basis that such material is considered objectionable, harmful, sensitive, or "inconvenient".[2][3][4] Censorship can be conducted by a government,[5] private institutions, and corporations.
In this case as far as I can tell the server provider (not CF) was repulsed by the site content. I support that choice and the company ability to make it. Still it is censorship.