With regards to fixing the Greek level 6 bug with Nightlife or for that matter fixing any University specific features, I doubt it will.
I believe the the Greek max level bug was fixed in Nightlife and should be fixed in the patch.
The reason I say this is Nightlife was created so that it only requires the main T2S game and can be installed with or without University. The only way they could fix something University specific that doesn't exist at all in the main game is to include that functionality, or at very least the basic code, with Nightlife. We know they aren't going to include all the University functionality and features because that would kill any remaining sales of University. It's possible they could include the code somehow and just not enable it, but as rushed as they seemed to be with these games and expansion packs, I somehow doubt they'd spend time on something like that.
C++ and behavioral scripting code that was added for University gets rolled forward to every expansion pack--that does not mean all features from University will be available though. As you figured out, it is disabled (but we did spend time on it).
Supposedly they are now claiming, contrary to what they have said in the past, that there will be a patch for University. That along with user created fixes like J.M.'s and TwoJeff's are probably the best we can hope for. I also expect that the Greek Amnesia fix will be far from the only hack that doesn't work with Nightlife either.
Edit: I just saw MaxoidTom's reply in the other forum and apparently at least with the Greek Amnesia bug (which is different than the Greek level 6 pledge bug) they actually have modified the underlying code so that Nightlife will fix it. So it seems it's possible with other University bugs too but there's no official list and of those who currently have the game I haven't seen any reports of which existing bugs it does or does not fix so I guess we will just have to wait. Supposedly, some people in the US should start getting the game today.
Hopefully, in most cases, there will be no need for some of these hack/fixes with Nightlife or the patch. In some cases, the Maxis fixes were in the same behavioral trees (as the mods) so having the hacks there would of course override anything Maxis patched/changed.