NVN is just an API, it's not an application binary. So 32bit will have no effect on it.Also, according to her, lacking 32-bit support prevents some games from working at all, and I'm not sure what effect that will have on NVN (do we know for sure it won't make any 32-bit calls?). Plus there may be obscure timing/mapping issues, so she may have much more work to do than it looks.
It'll take a bit of work/hacking to translate to Metal, but it's completely doable.
Will be interesting to see where this project goes.