Thank you for following up on this.
If they’re taking your assigned sex at birth into account, then they can still use the data because they can filter for people who were not assigned female at birth. It does require everyone to be honest, but so do most medical trials.
I hope the eventual overall results will only include people assigned female at birth rather than everyone who potentially participated in the study, and they did ask, so they can filter the data in that way.
Including a few extra people who were assigned male at birth but now identify as female is not that big a deal if they’re filtered out of the overall results - they will still be followed up, and their data could potentially be used for other studies (if they agree to their anonymised data being used for other studies, which I think is standard?)
It still misses out anyone was assigned female at birth but doesn’t identify as female. They could be a missed group for breast cancer, same as with lesbians and cervical cancer.
Did they ask anything more about medications, btw?