That tutorial to boot homebrew launcher is unnecessary complicated.
Follow it up to 0:25 seconds. (extract homebrew channel to SD card).
That's all.
then put SD card to WiiU, open your internet browser, visit
http://wiiubru.com
homebrew launcher will be loaded (or the console will freeze, unplug the power cord and just try again)
If you want to use this tool, you don't even need the homebrew launcher if you have the game disc!
What you need is a way to install TCPGecko.
https://gbatemp.net/threads/list-of-web-hosts-for-homebrew-exploit.429943/
Select a webhost which let you patch kernel31
once patched, reload the url and install TCPgecko (is cafiine working? it's marked as cheat engine)
that's all. you can launch your game and launch the program on your computer.
For loadiine it's even simplier,
run homebrew launcher, run loadiine, go to settings to enable TCPGecko, run the game.