Easy to miss: "The recent human trials involved 30 healthy volunteers, where 24 were treated with MVA-B, while the other 6 were treated with a placebo, carried out over a 48 week period."

This test was done on healthy volunteers, not ones with HIV. Although it's promising that 90% of the patients showed an immune response, we don't know how well that immune response translates into therapeutic benefit until it's trialled on HIV-positive patients.