It just seems to easy to Fake.
Can't you also view pictures on your TV from the 360? So, couldn't you be viewing a picture of the Avalaunch Menu and then access the shutdown command? Wouldn't that give you the exact same screen as shown?
Photoshop is another easy method.
Plus, someone mentioned the whole anonomous AND trusted source?!?! It can't really be both can it?
But, IF it is accurate, it means that Avalaunch or Surreal are running on top of the 360 dashboard. (Since it is the 360 Dashboard that allows you to access the shutdown command and runs in the background during games.) I'd be more impressed with a whole new OS running on the 360, not just one being emulated on the 360.