I think you’re trying to lead into some existential “what even is gendered sex” like its not obvious.
If you’re born with women parts you can be om womens team, or mens team for all i care.
If you’re born with mens parts, you may not compete against those that were born with womens parts.
Anything beyond that would need a doctors expertise.
lol. the claim was that transwomen aren’t allowed to play, period. Not true, they might not be allowed to compete against women, but open category (mens) is open for all.
Here is one example: https://www.badmintonengland.co.uk/wp-content/uploads/2024/10/Participation-in-Badminton-by-Transgender-and-Non-binary-Players-Policy-–-Frequently-Asked-Questions-FAQs.pdf
Who can compete within the open category?
All players can play within the open category. This includes, players assigned male at birth, players assigned female at birth, transgender males, transgender females, and non-binary players.