Chanakya, I'm not saying that a desire for inclusion is a completely fraudulent argument. What I am saying is that even if the *initial* argument is heartfelt and sincere...
1) there is no way for us to tell that it was sincere - it's unverifiable,
That's just the thing. It does seem to me there's a way to tell whether it was sincere. It does indeed seem verifiable. Not for some specific individual, obviously (for that we'd need mindreading devices!), but in the aggregate. That's what I'd spelled out in the rest of the post you've quoted from.
(Like I said, just an off-the-cuff idea of mine, that I'm not in the least in love with, and am happy to discard summarily if shown wanting! But still, as far as I can see so far, it does makes sense.)
It's a simple idea. I'm repeating myself --- for the very last time, promise! and that only because you didn't address this part of it from my post, and may have missed it --- but here's what it amounts to: Don't just limit yourself to newspaper and news-site reports, which obviously will generally cover only the more elevated levels of sports events. Doing which isn't meaningful, for reasons that you've yourself argued out very rightly, about transmen not being able to do well in men's categories, and not being able to reach those higher levels at all.
Instead, do a comprehensive sampling thing down at the humblest levels of sports participation, both amateur sports and professional sports as well, right down to the very basic level at which someone who has a notion of competing might start out competing. Do that, and don't worry about whether they're winning or losing anything, just look at whether or not substantial numbers of transmen are competing in men's categories. If the answer is Yes, then that's verification, right there, that in the aggregate the inclusion plea is sincere. If not, then we have evidence that, in aggregate, the inclusion plea is a lie.
(Generic "you", obviously. Not asking
you to do it, obviously, or immediately provide that data! Just suggesting a way how "we" might, how someone might, some research team might, go about verifying this thing, and assessing whether in aggregate the inclusion argument is sincere.)
and
2) it provides a loophole by which insincere people can exploit the goodwill of others - in this case, given the lopsided nature of physicality by sex, the result is that insincere males have gained a way to exploit the good nature of females and of sporting authorities.
See my post just prior, addressing both this part of what you've said, as well as lionking's post. Agreed, it isn't as if the inclusion argument is the only one. There are other arguments as well, absolutely, other arguments that are independent of this one.