I don't think you're unreasonable, you have more context than myself and any other casual North American sports fan who (shockingly!) hasn't learned the points per game rates of Aussie rules footie. BUT, for most who have a casual understanding of sports, seeing someone a foot taller than their competition makes us go "huh, that seems wild."
As we do when reading one of the most reputable papers in the world raising concerns about transgender health science methodology.
(For what it's worth, in my personal experience of playing mid level co-ed rec league sports in a large liberal city for awhile, I've played against a few teams, mostly their trans player was the best woman on their team and by not a small margin. We don't give a shit because, like I said, mid level co-ed rec league sports.)
The fact you feel compelled to "call out" someone trying to sincerely answer a reasonable question kinda speaks volumes.