Good point. It's intriguing that - under the Bangui definition - the typical symptoms for (for instance) tuberculosis – fever, weight loss and coughing – are officially considered to be AIDs, and not TB. It's a uniquely modern miracle, like the equally wondrous theory of Global Warming. The putative HIV virus may be ravaging Africa but hey! it's curing TB!
Many of the first AIDS victims died of Sarcosi's Syndrome, a form of cancer, so they decided that if you died of Sarcosi's Syndrome, you probably had AIDS. Since AIDS compromises the immune system, it's common for AIDS victims to die prematurely of some other disease.
Then they started adding other diseases to the list. Pretty soon, anybody in Africa who died of any disease was likely to be listed as an AIDS victim. Why not? Possibly they were, and the more AIDS victims, the more AIDS funding.