It's pretty funny they say that this forum is heavily censored, this is one of the least censored forums that I know of.
Well, usually those complaints are baseless. Those posts get caused by various reasons, but I've yet to see 1 case of censorship that this happen. Just because one doesn't agree with the moderation policy, that doesn't mean that they're being censored (if it applies to them in a case).
I can imagine that mistakes may happen, especially when you're moderating such a huge number of posts each day. But in general, I haven't seen much genuine complains of censorship in the Meta section of the forum.
And the rules of this forum perfectly reflect the 'level of openness', I think.