It's interesting that this is a very specific charity dealing with extreme sex discrimination in other countries.
They are unlikely to be able to get away with the wishy-washy categorisation that eg Tampax manufacturers in this country can.
The women they deal with are quite clearly oppressed on the basis of their biology.
They are never going to be able to square the circle.
Because if they include transwomen and transgirls in order to adhere to the ideology, they have to exclude transmen and transboys.
That they are unlikely to come across trans anyone, is now irrelevant, as they have rashly tied themselves to the rules.
They either commit to the ideology and exclude biological women because of it, or they include biological women in flat denial of gender ideology.
It's so stupid.
And the worst of it is I bet the cognitive dissonance and clear conflict of rights won't be the thing that grabs their attention. It will just be word salady damage limitation all the way.