I spent a year working in a molecular genetics lab, and unless there is something here besides what I am reading, there is no way this enzyme in itself would cure HIV. The tricky part would be a delivery system into every cell in the body allowing it to access the HIV. Even then it is unlikely you would be able to get it all, forcing the user to constantly take these drugs. The trick would be to make the enzyme fit the virus in a way that would stop it from mutating into a viable strain that would avoid the enzyme.
As for why MJ is still alive. Yes we already have drugs that supress HIV and yes they are very expensive. They don't supress the virus indefinately and some of the side effects are quite severe. Recently the largest drug companies have all agreed to not enforce patents in Africa, however. Of course this makes little difference. People there are dying of diseases curable by common antibiotics or clean water..... now try getting them complex drug therapies.
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