En ese video se ve claramente que ninguno de los 2 perfiles que posee tiene comprado los juegos de ejecuta.
Parece real desde luego.
EDITO: En gbatemp hay un usuario que cree saber como lo han hecho:
Some of you guys heard about a facebook group that claimed to achieve loading games from USB for free, and I think I now know how they did it.
(BTW, OTP dumper needed)
Remember how any USB plugged into Wii U will be formated using a special per-console-key?
I think they made a software that asks you to enter the per-console-key (obtained by OTP dumper) and then it will format your USB and insert a WUD into your USB.
The reason you could only insert WUDs because they include the ticket.
REALLY clever guys!