I doubt that it's the bone marrow transplant that caused a cure. Of course people are gonna keep trying new methods and hope that they can cure AIDS, but I half expect in the near future they will just try to kill off all the infected cells and try to force the body to produce new white blood cells, while keeping the patient in a strict de-bacterialized envirnment.
Why did this work though? It could be that the AIDS in the afflicted's body were all mutated to only attack the existing white blood cells produced. The transplanted marrow developed new blood cells that were able to kill off the AIDS virus.... that or he
A). Still has them, but wasn't detected as said in the article
B). Never had them to begin with.