Which is what I said.
https://hyrox.com/rulebook/
It also gives the set events in Hyrox. Guess what? Mr Gabriel gets to drag 50kg less when he enters the Pro Women's comp instead of the Pro Mens. That's handy.
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You can contribute to Gabriel's Go Fund Me if you like. Gabriel wants £8k to relocate to Berlin where he can presumably drag 50kg less than other men in Hyrox to his heart's content and keep his rankings in the Women's division.
https://www.gofundme.com/f/lucis-relocation-fund
If you actually read the piece you posted, 2.2 says that in order to be considered(placed) in the rankings those taking part must register under their birth gender. Otherwise they(HYROX) won't be including them in their rankings.
As for taking part to get a better time and finishing position, one does not equate to the other. Even in two events where there are the same number of people taking part.
A lot can depend on the day, the weather and even the feel of the course. You can get carried along by the crowd, those taking part and those watching. Course time may be faster or slower on the day, meaning it's possible to finish lower down with a faster time, or even higher up, position wise, with a slower time than your previous best in either time or position.