Honestly the most likely scenario in my mind is that he had
some regrowth, but grew out the parts that
can be grown out longer. Where he’s not constantly buzzing over that bald patch he has some long hair to style over it, and the wispy hairs underneath that are growing (probably way slower) to give it a little more volume and appearance of length. I’d be curious to see a top down photo of his hair wet and another of his hair unstyled, dried naturally (as blow dryers often give volume).
you can see some regrowth on hrt and all that, it’s certainly not out of the question, but estrogen can oftentimes be quite unkind to the male hairline. If I was a betting person I’d bet that it’s a dsp style comb over/back/floofed over the thin part for ~feminine beauty~. Many mtfs add finasteride (hair growth medicine) to their cocktails due to hair thinning, but others can see a rejuvenated scalp. Wet, unstyled, naturally dried hair doesn’t lie though so