Whilst HIV might have been a genuine reason not to grant a Class 1, 10-20 years ago, it isn't today. Nowadays any risk is going to arise from the drug therapy in use rather than the underlying pathology.
The 'CAA's attitude', as the article points out, is of course dictated by EASA. Also interesting to see that the old OML and 1% rule comes up again.
"The reason pilots with HIV have to have an OML is because, he said, “the best-case scenario of risk that they are able to state [on the data being used] is you have a 0.5% chance of incapacitation.”But in order to fly solo and not need the limitation on the medical certificate pilots have to be considered to have a risk of incapacitation of 0.1% or less."
I would love to know how that risk is actually calculated statistically, in fact I would love someone to legally challenge it.