when he says linux he means AmigaDE on linux. When he says windows he means AmigaDE on windows.
I guess he used this kind of language because not everybody knows about AmigaDE, and I think it is smart to do it this way.
If you say that x game runs on AmigaDE, Joe X, would think, "whattafac is amigaDE!? I have a PC/Linux computer, so this game doesn' work on my setup!"
While if you say that this game is for windows, he could say "aight! lemme buy it and try it out!". Then he buys he tries out and has got a lot of fun. You see, AmigaDE has got to be advertised to software houses not to end consumers.
It really doesn't change anything if the end consumer knows or doesn't know about the fact that his game is running on AmigaDE