Agreed Gingernut, but I suspect the 2 issues of concern are pneumocystis (I have seen patients go from a bit of a cough to collapse in less time than a long haul flight) and cerebral issues leading to psychosis. Both would be a no no and far more concern to a doctor than fatigue. Even if you can prove fatigue caused an accident, you blame the legislators. If it were HIV you blame the doctor who signed the pilot off.
I would hope that pilots who have been clear of complications for a period of time on retrovirals and who have a low viral load could in the future be reconsidered, as my understanding is that they are near zero risk compared with HIV positive patients with complications, off retrovirals and with a high load
However, the regulator seems to be treating risk in this case as if it were 1995 not 2017. We know they take ages to catch up with modern medicine because they are not obliged to change and want to avoid repercussions....