Public spaces have been commercialized to the extent that if a corporation tells you to shut up, that limits your exposure far more than anything the government can do, because our entire communications infrastructure is private hands.
It's the reason why so many people want the Internet to be considered a digital commons in order to prevent corporations from giving preferential treatment to some data on the Internet. Same thing. If Comcast wants to deny Netflix bandwidth, there the argument made above applies to them, as well.
This is a gross and unfair simplification of a complex issue and one the author isn't even consistent about, given his feelings about net neutrality. You can't say, on one hand, that kicking Duck Dynasty off the air isn't censorship but then expect your cable provider to suck up the bill of your Netflix use.