This might honestly be the least-thought out article I’ve ever read in my life, I actually had to read it multiple times to make sure it wasn’t satire.
The fact that you think it would be fine for a man to decide to identify as a woman, then go and dominate the other natural-born females is just ludicrous.
There’s nothing transphobic about believing someone born a man shouldn’t compete against someone born a woman. Men have natural biological advantages over women that make them superior athletically, and it would be unfair for natural-born females to compete against natural-born males in basically any sport.
Now, if a woman wants to compete with men, that’s completely fine and there’s basically nothing stopping them from doing this (other than their own inability to compete with men at the highest level of sports). Notably, LPGA golfers have competed in men’s tournaments, Danica Patrick has competed in men’s Indy Car and NASCAR racing, ect.
But your premise that there is anything transphobic or prejudiced about not believing a natural-born male should compete against natural-born females is just completely misguided.