According to the Nintendont sticky, this mayflash adapter works with Nintendont
http://www.mayflash.com/Products/NINTENDOWiiU/W007.html
And on that page it notes that the one you showed is the newer version http://www.mayflash.com/Products/NINTENDOWiiGC/W0142.html
So I would assume so, but I'm...