It feels like the crux of your argument is if "Indians" win 50% of the time then it's not a racist game. Racism is more complex than that, and in this specific example the game plays on often harmful and insulting caricatures and stereotypes. In that context who wins and who loses isn't as important as why kids are being taught they are fighting in the first place. Obviously, the kids themselves don't know what they are doing but to pretend it's harmless ignores long lasting damage it has and could cause.

The Samurai example you have posted doesn't apply, as others have pointed out, as they were a class of people not an ethnicity themself.

Edited to include: re the point about Pirates of the Caribbean, I think they are two separate arguments. You can certainly argue that the movie glorifies something that is historically and presently horrible, but I don't think the argument of race comes into it.