For those in countries that censor the Internet, such as the UK where I live, this page basically says what Anna's Archive is (very superficially), shares some useful URLs to accessing the data, asks for donations, and says an "enterprise-level donation" can get you access to a SFTP server with their files on it.
Umm... I'm in the UK and I can see the page fine. Why would you expect this page to be censored?
I wonder if it's blocked simply by DNS manipulation and therefore only people using the ISP DNS have issues.