How do you know that? There's quite a considerable variance in the age at which boys start puberty, and they tend to start puberty a year or two later than girls.
“The article doesn’t state how he got HIV. Let me get to this another way. The victim, at 14, is post pubescent. Therefore, this is NOT pedophilia. It’s predatory homosexuality.”
Left wing people could claim that this had nothing to do with homosexuality in the same way that they claim that the Catholic Church sex scandal had nothing in particular to do with homosexual priests.