That is silly. If you play well enough to be in the NBA, what does it matter? Getting into the NBA is a matter of ability. You can be 10 feet tall and still not good enough to make it. Or you can be 5'3" and playing right now. 

People come up with fallacies like yours all the time, but they don't correlate to the reality of transgender people (or reality in general.) Studies on transgender people show biological evidence to back up their claims. It's kinda like accusing someone with one black and one white parent of being "trans racial" for adopting cultural elements from the black community. Or, to relate it to your fallacy, it is like being 7 feet tall and complaining that the NBA should let you in despite never having played basketball. It doesn't make a lot of sense. There is a lot more to it.