Not sure what is making this game work for me.
Here's my hardware setup:
WiiKey 2 w. 1.2 core (disc update blocking on)
Firmware 4.1 and everything in this guide
Disc burned @ 1x with ImgBurn on Verbatim DVD-R's.
Again, this game is up and running with this setup.
I tried to run this via USB Loader GX and it failed out. It's something with the hardware modchip that's bypassing whatever new security is on the disc.