Having read a lot of the thread it sounds like that's sort of what's going on with the version on the AUR. Sounds like it is the old GPL v3 version and the dev doesn't wanna put the new CC BY-NC-ND version on the AUR themselves because they don't want to make an account there (understandable, not saying they should have to).
The whole situation is sort of sad, but ultimately devs working on free (as in money, I now -ND is not libre) software need to do what they need to do to remain sane. If it's a CC BY-NC-ND emulator without Linux support versus no emulator at all I think we'd all want the first.
I hope this thread can be an eye opener for folks to remember to treat volunteer devs with respect. (Not implying anyone here was part of the problem.)
Oh, that's weird, you'd think there'd be a way to tell whatever is on air to download a specific tag. Or like one that downloads the other indirectly. I haven't looked into pkgbuild or aur.