Looking at my parkrun, #54/500 is the fastest woman. On the day she set that, she set the world female parkrun record. There's 23 women on the list.
As pure fact it's interesting seeing that context, and there are other more useful data provided too with the age gradings and sub 20/ 17 lists.
Interestingly, the top 500 list at my junior parkrun is far more balanced. Fastest female is #15. In the u10 category, the sex makes little difference, and in the 11-14, the girls get a temporary boost at the lower end of the range, and it's about 13-14 when the male advantage emerges.
I'm a very average runner and will never get on those lists. I love the fact that I can see how average I am for my class, aim to beat my own pbs, jog or walk around at my own pace and just rock up on a Saturday morning. It always has been a timed run, always has been keen on producing data, and always has valued participation.
The gender self-ID is a seperate issue, but as much as it stinks that men can self ID as women and claim times that can only be matched by elite women, I don't know what practical action parkrun could take to manage it. It's not going to be clear at the finish line, or barcode scanning stage, and by the time the results are published each week it would be hard to piece together that a result is claimed by a gender that doesn't match the sex. RDs spend hours each week making the events happen without risking incurring political wrath. It's not just about an HQ policy, it's about thousands of volunteers being able to uphold it each week.