Look how the world's turned upside down! On the face of it, parsing that sentence makes it appear that some normal woman was suffering at the hands of weirdos called "cisgender females".
In fact that description wins the George Orwell award for turning the world on its head. The correct way to write that sentence would have been
"unfair for him to have competed against normal females".I have no idea what "cisgender" means exactly but it is always used to marginalize normal people. It is a pejorative synonym for normal.
Cisgender means emotionally disturbed and/or pervert.