That's part of the reason that "biological male" isn't a highly informative/technically-precise term, but assuming you mean something like Swyer syndrome, there

That's part of the reason that "biological male" isn't a highly informative/technically-precise term, but assuming you mean something like Swyer syndrome, there isn't really a reason to worry about estrogen making them infertile, so in context using the phrase "transgender women" would have been clear regardless.