That's kind of hard to make out, but even if it does the same thing, that's a tiny, focused screen area. The one on the Gamecube SP mockup is spread across the top, and even has sections cut out of it (around the play control buttons), yet in the mockup, there's no noticeable start or stop points where the screen areas are. (Not that it has to match reality, just saying with how the mockup portrays it.) It just looks like a smooth top with floating text on it, which is part of the surreal appeal, I think.
If OLED can do that, though, that'd be cool.