There's way more than that.
And what measures a "market" anyway? How much the console sells? How many games are sold? This argument is stupid. There are some people like Akubane that have all consoles but still play PC games over it, and vice versa. Someone might buy a console and never end up using it. Does this study include console accessories and controllers? If so, did they include gaming keyboards, mice, headsets, gamepads, speakers, graphics cards, and more?
And who's to say someone that plays Minesweeper all day isn't a gamer?