Looks like you got your wish From mathieulh (who gets his info from the AU cracker xorloser aka CitizenX of Paradox that he trades SDK stuff for lmao! - via gbatemp.net/threads/super-mario-3d-world-usa-wiiu-powerup.366269/page-8#post-5004085):
"My guess is this wiikeyU uses a software exploit that is probably going around in private circles and that some of these "release groups" use to dump the game.
That's just a wild guess though
As far as I am concerned, I am just interested in getting rid of the stupid region lock so I can play Japanese games on my European unit."
Conclusion: Anyone clueless enough to donate to these dinks or blow money on an unnecessary hardware mods deserves to be left in the dark as to what really goes on behind the scenes.