I'm a lesbian mum. My thoughts are as long as the child is well loved and cared for the sexuality or gender of the parents is irrelevant... I've been told here on FWR numerous times that my kids have the right to a father and I am selfish for having them in a lesbian relationship. No doubt these same posters agree with Posie that trans men should be sterilised.
And, yet again, you elide the substantive point you're responding to and extrapolating to something which nobody, including Posie, has said. Here is the substantive point again.
Were a lesbian mum to transition, would that person then become the heterosexual father and would that person then have the right to impose that identity and relationship on the child? Would that be in the child's best interests?
As I said previously, given the Freddy McConnell case, the courts agree with Posie: the child's right to its mother supercedes the right of the parent to choose to be its father.
This is consistent with what we now know about the best interests of the child in cases of adoption: they are served better by the truth of material reality and hence best practice is to be honest about this and, in many cases, preserve some, albeit minor, communication with the birth parent. Even though this may make adoptive parents feel insecure at times, it's in the best interests of the child.
Please try to respond to the substance of the points put to you rather than continuing to misrepresent them.