Hello,
I confirm that it works on my WIIU 5.5.2 EUR version with http://u.drg.li/
I clicked on fast version link and then the big exploit link.
Afterwards I installed Haxchi as documented here with New Super Mario Bros (EUR E-shop)...
Nuh it was a joke, but I used to bite my nails when I was young, but when I started doing construction work and seen what crap was under my nails, I stopped.