What I'm seeing in the video:
1. His Wii U is on. He takes out the SD card and the Smash DVD. The HDD is unplugged.
2. He shows his gamepad, there's only one game installed (Zelda TWW)
3. He turns off his Wii U and connects the HDD.
4. He turns it on again, and SM3DW, MK8 and Phineas & Pherb appear installed.
5. He boots up MK8 and enters the eShop, which shows that the game has not been purchased on that account.
Take that as you will. If it's a fake, it's an elaborate one. It would require two Wii Us and some fast switching between both. I'm inclined to believe it's real, though I'm in no hurry to find out.