Well, technically, since Morrus has opened these fora to the public, you could make the argument that it is possible to exercise censorship. ENWorld is more like a "place of business" than it is a "private club."
But I hope that's a moot point. I haven't seen anything like censorship around here and I don't expect to.
I do find the ban stifling on principle... whether or not it forbids anything that wasn't already forbidden, it does create an aura of wariness. I personally think the ban has served its purpose, but it's not my site and that's not my judgment to make. It's a signal to noise question. The way the ban was implemented is not a matter of censorship so much as the kinds of discussion that are considered topical.
The reason we have the ban is because a thread on the topic "4e is New Coke" or whatever is a lot more inflammatory than someone posting, "Champions: The New Millenium was Crystal Pepsi." While I'm not a big fan of "your game sucks/no it rocks" arguments, I think the ban is a problem for discussions in which someone wants to be evaluative about a game. In theory, "4e is the New Coke" is an invitation for people to comment on the metaphor. As a practical matter, the mods shouldn't have to deal with the inevitible dogpiles.
Obviously, I can't speak for the mods, but that's basically how I see this situation.