Yup, I currently own an AMD card. But I also owned an NVIDIA card in the past, and I recalled being able to force AA on everything in TRON 2.0 as well.
I actually think you should add your discovery as a note to AA section of the page. On the AMD side of things, there are less options when it comes to forcing AA. You just set the Catalyst Control Center to "Override application settings" and you're done. On the NVIDIA side of things in the Control Panel, you have both "Enhance" and "Override".
I did some reading, and it seems the NVIDIA driver will only use the "Override" setting on applications/games it recognizes from a predetermined list. It looks like that's why AA didn't work for you. Whereas with "Enhance" it will apparently just implement the selected AA on top of what's already there (other forms of AA or no AA), regardless.