Actually, the game does offer a multitude of endings. It all depends on how much you prepare. Not all the endings are good, some are downright depressing. However. It's got more than five, and it's not A, B, or C. So the argument could be. The game has more than those three endings.
That works for the A, B, and C quote. But I think we can all agree that the endings do not "diverge into wildly different conclusions based on the players actions in the first two chapters." If he had just said, "diverge wildly" then you could...I guess argue that if you imagine all the parts they didn't show you, it does, you just don't know how
for certain, because they didn't show you. But the actions of the first two games really have minimal effect if any, especially if you play a bit of multiplayer to beef up your final military rating. There is nothing
in either of the previous two games that directly effects the ending. Heck, there's no choice in the game the ending is for
that directly effects the ending, except the choice of the ending.
Or the promise that they wouldn't "pull a Lost" and leave more questions than answers. The ending was pretty much the definition
of leaving more questions than answers, and after the release the director, Hudson, was actually proud that it did, explicitly stating they really wanted to do something with the ending on the opposite side of the promises about what they were
going to do with the ending pre-release.
Again, not saying that this means they should. If I turn on the T.V. and watch one commercial break, I'll be lied to at least five times. Companies do it. But even if you say, "The very minor distinctions make it so that there are more than just A, B, and C," it's pretty hard to argue they kept their word on the others. And that's without really digging for quotes, myself.