The blocking of Facebook and Google is directly related to PRISM, social contagion theory, international surveillance, and weaponized media.
These issues are extremely complex and no single article or HN comment is going to cover it in it's entirety. I think the second bullet point is awfully good justification for China to have a 'less free internet score'. I'm definitely not going to claim that China doesn't engage in domestic censorship outside of international pressures - I believe they absolutely do.
But that's a different issue and not what I was trying to establish. In part, the comment is a good opportunity to alert people who don't understand that weaponization of media (psyops warfare) is prevalent on the internet today - including the 'free countries'. Thankfully, readers will observe this section of the thread and get clarity. :)