Correction: they claim that it is. The 451 code is specifically made for that, referencing Fahrenheit 451, so using this specific code implies censorship.

However, it would be totally legal for them to provide the content. They just don't want to take responsibility for their privacy invading practices. So it's not censorship at all.

/me shrugs. Personally, I have yet to find the website I can't just close if it behaves like this.