Only the download page http://www.python.org/download/ is blocked by the Great Firewall, and has been for over 2 years now. Your referenced page says 15th Oct 2009, which seems about right.

Perhaps the reason is it's perceived as a "Google" product because the inventor Guido van Rossum works there.

Aside... China PyCon is on now (http://cn.pycon.org/2011/) in Shanghai (Dec 3 & 4th 2011).