@mvulusi96
He was under a considerable amount of stress around that time; his father's regime was collapsing before his very eyes and his fate was hanging in the balance as political enemies felt emboldened during this time. If he had been suffering from HIV, perhaps all of these aggressive changes complicated his illness and further advanced his mortality.
Although, I question if his cause of death was really from AIDS. Wasn't he actively working to undermind the military control of Kinshasa by Kabila, even after his father's death? In none of the last photos of him does he show any known symptoms of HIV/AIDS.
I suspect he was poisoned, but maybe my conspiracy theories are a bit far fetched.