It is NOT censorship for Disney to not release a movie.

I understand that your argument lies somewhere in the area of "it's a business decision" as opposed to "they're out to prevent this message from reaching the public", and I think that you're half right, but ....

I find a lot of people using that argument in general, and one thing that I've noticed is that they want to claim that just because it's not backed by law it's not censorship, which is an invalid conclusion. It's "illegal" for the government to sponsor censorship. (Although there always have been areas where they claim the right to do so, and those areas are increasing, especially as of late.) Companies can also censor, and it's not illegal, but that doesn't make it not censorship.

It's certainly a legitmate political stance to believe that no one should engage in censorship, though, and I think that's what Moore is saying. You can disagree with either that stance, the idea that it's censorship to begin with, or both. But that doesn't inherently make his point invalid.