They had native support because the hardware needed to run them was there. The Wii had GC's CPU and an upgraded GPU still capable of handling GC's scenario. The Wii U had a tri-core CPU that was compatible as Wii's CPU (using one core of course)...
Video guides are, in general, not recommended. Did you follow one for Aroma, for ISFShax, or both?
Just to make sure, run the Aroma updater, or manually update Aroma and your plugins
As for reebabling autistrart, yes that's correct
1785835776...
I've read of some consoles freezing when leaving settings, but I've never encountered that issue personally so honestly I don't know what would cause it.
Freezing when exiting the plugins menu is extremely weird tho, could you check if Aroma is...