Did my duty and read the actual text of the changes to the law so I know how to dismiss "it's fine and fair" type talk.
"It doesn't have to be about genitals" is a non-starter. The required parameters are genitals, chromosomes, and testosterone. So one of those is easy to check, and any one counts. So girls with high T are gonna get challenged, girls who are fine except they are trans are gonna get persecuted.