The game is a hoax. Its just a mod of the GoldenEye: Rogue Agent game on the DS.
Plus if you read Scott Dewitt's post on F@NBOY$ you'll see he points out a few good points.
1. Your scores never went up
2. The time never changed
3. You shot right handed guns with left bumber.
4. There was no waiting time for you to host a multiplayer session
5. Innacurate ammo counts for the plasma rifle. Anyone who plays Halo can tell you it doesn't exceed 100 shots.
6. The signal meter was non existant. It was there, but never showed any signs of being used.
7. Slots for other joined players were empty when you were obviously "playing" against a human opponent. (this along with the no load times are the biggest flaws in the video)
8. At the end the camera moved upwards when you were moving the stylus left and right (read: not up at all)
9. I like how it cuts off right before the nice warthog physics could have kicked in.
Plus people should know now what some people can do with mods. Just check out Haloid for proof.