If this is correct though, surely in males, this continued growth would lead to greater than expected height in MtF?
I'm confused on this as well - I've seen contradictory information on the height effects of blockers (and other hormone messing). I guess if there is a specific puberty growth "phase" there's plenty of scope for messing with it either way by adjusting the entry point and/or end point.
As a general observation, even without puberty blockers, it does seem to be the case that FtM tend to be small and MtF tend to be big (for their sex). I just don't see 5'11" FtMs or 5'4" MtFs often. They're 5'0" and 6'2".
But that's just my impression. Not seen any actual data on it.
It's possible that there could be two overlapping phenomena here - extreme height making you more aware of your sex and hence increasing dysphoria/body discomfort, hence MtF transition selecting for tall people, and this possibility that transed boys get increased height through hormone disruption.
There are historical records that castrati had a quite particular physique, including being unusually tall. Wikipedia:
As the castrato's body grew, his lack of testosterone meant that his epiphyses (bone-joints) did not harden in the normal manner. Thus the limbs of the castrati often grew unusually long, as did their ribs. This, combined with intensive training, gave them unrivalled lung-power and breath capacity.
We should presumably expect to see the same effect in boys with sufficiently-blocked puberty. But presumably the introduction of cross-sex-hormones then moves away from that path.
(But noting last sentence of that quote - hmm, a male who didn't go through male puberty wouldn't have a sports advantage, eh?)