She calls for these changes and everything, but then turns around and states that there are companies that are already making games that do what she states she wants. Games are an form of artistic expression and if there are companies that make games that don't use damsels in distress, don't misrepresent women, don't objectify women and don't use them as background objects already then her whole platform has been destroyed by her from the start.
My impression is that she's not saying that games that "do what she states she wants," but that she wishes that more games and game studios would "do what she states she wants." If my impression is correct, then there is no contradiction and no destruction of her "platform," because if my impression is correct, her "platform" never included the notion that there are no games that "do what she states she wants."
And if the people sharing her view are niche market, which I don't believe, a few games out of thousands isn't enough to cater to that market - once they play those games and finish, they'd want new ones, obviously.
Not to mention if I want games that do X, Y, and Z, I might hold up examples of games that do X, examples of other games that do Y, and examples of games that do Z, but that doesn't automatically mean there are games that combine X,Y, and Z smoothly enough. And even if there are a few XYZ games, that doesn't automatically mean they were well-designed and worth playing.
The goal isn't "a single non-sexist game". I naturally assume Anita's goal is, "enough non-sexist games to satisfy non-sexist gamers, and the games must be actually enjoyable to play". Well, her goal possibly might even be, "...and the removal of everything else I don't agree with.", but we can ignore the unrealistic parts of her desires without throwing out the more valid parts of her arguments and desires.