I've read the policy. It's similar to cycling body policies, such as USA Cycling which is more than a year old and working fine on paper and in the real world. It's the only thing that makes sense from both a human standpoint and a competitive one. If athletes are being tested it will work.
People may jump to conclusions about people whose sex assigned at birth was male and who now are women. Dissecting that, many don't understand trans women are real women. That fact will be argued with incessantly because BEING trans is so far from the cisgender experience. Empathy's been described as "seeing with the eyes of another, listening with the ears of another, and feeling with the heart of another." Most of the world cannot empathize with transgender people, so they're misunderstood and easily judged. The reality is we ALL have two genders -- the one we were assigned with a quick glance from a doctor at birth and the each of us feels inside. For nearly all people those genders are aligned. For some of us, it is not. Gender is not about genitals. Period. You can call that biological sex or sex assigned at birth or whatever, but you can't call that gender.
The other part of what's behind that statement regarding trans women being real women is that HRT (Hormone Replacement Therapy), is incredibly effective. That men are not eager to see their athletic superiority over women as a function of a few chemicals floating around in one's body is a natural reaction, given the sexism sown so deeply into the fabric of our world. It's hard to believe it until you either empirically test it or you feel it in your own body. I have felt it. I know what it means. The last time I raced, a half iron distance triathlon this summer, my estrogen levels where too high (I don't get tested as often as I should, and my body responds exceedingly well to testosterone blockers and estrogen supplements). My result? I was the last woman in my age group out of the water. I nearly DNFed right then and there, but I got on the bike anyway. Getting off the bike I crumpled to the ground and again nearly DNFed. But as endurance athletes we're wired to keep going. During the "run" (which more resembled a death march), I got dizzy and had to lie down on the side of the road. I'd probably still be there except it was easier to get up and keep going than to have to answer everyone's questions as they passed by. I finished that race more than two hours slower than the last half iron I did before I started HRT. Volunteers were packing up the course as I made my way through the last mile. No one can ever tell me I'm anywhere near the same athlete I was before my transition. I have bounced back since getting my estrogen into the proper range. Thankfully.
For decades the medical and mental health establishment pathologized us. That's finally turned around. Mainstream media continues to paint their misogynistic portraits, and so much of America sees but a sexualized version of us. If you don't know a transgender person, go find one as a friend. If you haven't read anything beyond the sensationalist garbage out there, find something worthy of your time to read that doesn't insult your intelligence AND mine.
There's a lot of privilege for folks who don't have to be third class citizens because of their gender identity. But the greatest privilege of all is one I now enjoy fully -- simply being me. Running has always been a big part of who I am, and I know many other trans people who feel the same. We deserve the same damn rights as any other human being. There is no advantage in being trans; there are only disadvantages. A really really long list of them. It will take decades for society to let go of the tired old tropes and misunderstandings around who we are. I get that. You can't possibly feel what I feel. In the meantime, we just want to run and be ourselves. That's not a hell of a lot to ask.