There is a gender pay gap.
You can compare like for like jobs etc and not find one. I probably earn more than my male counterparts as one example.
But women are disproportionately worse off, because there is a cultural, legal and logistic disadvantage for women.
Women are EXPECTED to give up their careers to child rear, how many companies do you know that pay occupational maternity pay, but only offer men the statutory amount if they take shared parental leave?
Logistically that's a challenge, legally it's allowed.
Therefore women lose years of incremental pay rises, and exposure to opportunities in the workplace.
Culturally we think woman who have taken time off to look after children as losing workplace skills, not pausing them, let alone enhancing them.
I know I personally became a better people manager and more patient after my maternity leave. (Diligently keeping your cool when a toddler loses their shit over nothing, is quite comparable to a CEO, well behaving the same). It's hard to convince employers that though, especially if you took longer than a year off.
(I took only 6 months off, and quite good at my job, so explains why I am winning the pay gap war right now)
The whole gender identity crisis amuses me greatly, given gender is totally made up.
Please self ID to the purple broccoli mustard gender, as much as you god damn please.
But it's sex that should drive statics, people born with ovaries are predisposed to being prejudiced against. Any born woman who has had a job interview in their late twenties can testify, especially if you don't already have kids. You know the interviewer is thinking when will this woman go on maternity leave...
It's not a gender pay gap, it's a biological sex pay gap. Doesn't have the same ring to it though!