No and I never said that. They teach tactics and strategy, and the outcomes changes with the competency of the officers in charge. A war game isn't exactly a "what if," because they're actually doing it real time most if the time, that is.
I never went to military school and so don't really know what their games are like. Sometimes it could be a video game, and I have my doubts whether or not those are useful or just entertainment. Video games don't train you for action, they simply develop keyboard reflexes. Now if the video is a simulator it can be very helpful ... as in an aircraft simulator. That isn't a "war game," however.
At Red Flag and Top Gun, they fly the missions and it's all real except for the live ammunition. Ditto for Army tank and helicopter games. Same for submarines and other naval assets, too.
The military is always doing 'what ifs' war games and they ain't video games. During the Cold War all kinds of 'what ifs' were done if the Soviets attacked in Europe, for example. Military schools take old battles and refight them.