Frankly, he'd be less of a bullshit merchant if he hadn't called the game "FortressCraft". There is literally only ONE reason he'd call it that. It's the same reason Gameloft call their CoD rip-off "Modern Combat".
The fact he is even bothering to argue against this is sad. It just makes him look petty, and he is annoyed he is going to lose a lot of income once Minecraft is released on Xbox. So instead of being gracious, he's going to throw a hissy fit and tarnish his name in the eyes of gamers so they won't respect him, and not buy whatever he does next.