Az Hakeem should be understood within the frame of what he's trying to accomplish. Blanchard's approach was essentially observational with an attempt to reduce suffering of trans identified individuals. He felt AGP should be a neutral word (he created it to be neutral) and shouldn't imply a value judgement or condition the rights of trans people.
At the time Blanchard was most active, a large number a TIMs lied about sexual orientation and the sexual aspect of their identification in order to get treatment. (Gender clinics were heavily biased toward treating very effeminate homosexual men) Blanchard tried to destigmatise that and noted that, in fact, heterosexual AGP was the more stable form of transgender identification rather than a contraindication.
Hakeem's frame is one of treatment with an emphasis of desistance where possible. For him it's important to recontextualise and refine the sexual aspect of trans identification in males in order to tailor treatments that might be successful in helping them desist. Hakeem doesn't deny the sexual aspects of a large majority of heterosexual identification but he feels that it's secondary or misdirected in a large number of cases, rather than primary. He's not disputing Blarchard's finding of 80% AGP among adult heterosexual men seeking to transition, instead he's disputing Blanchard's diagnostic criteria for AGP as being overly blunt, and refining the meaning of AGP.
I'm sympathetic with Hakeem's approach - obviously the term 'AGP' is capable of eliciting a huge negative presumption when talking about trans identification. But I think it's a mistake to redefine what is a highly robust clinical typology (AGP) just because of its present-day connotation of political incorrectness.