Saw this on the IOC transgender policy 2018:
“2. Those who transition from male to female are eligible to compete in the female category under the following conditions:
2.1. The athlete has declared that her gender identity is female. The declaration cannot be changed, for sporting purposes, for a minimum of four years.”
I can understand them not being allowed to switch between the two ( although obviously there is that cricketer who does) , but basically means that women are stuck with them for 4 years even if they do want to go back to the male Cat.