I really think GC women need to let go of this fixation about whether or not men (however they identify) can carry a pregnancy. It is highly likely that, within the next 10 years, it will happen. People who say it's impossible seriously underestimate the sophistication of transplant medicine. The hormones of pregnancy can be given artificially.
I am not saying it is good, I am not saying it is ethical, I am saying it (probably) will happen. By trying to argue that it won't, and that this proves that women are different from TW, we are setting ourselves a trap. The minute that a TW carries a pregnancy, that will be thrown back in our faces as 'proof' that TWAW.
The truth is that artificially maintaining a pregnancy in a male body proves nothing. Scientists have grown human ears on the back of mice: that doesn't mean that mice have human ears. If a few highly privileged men carry pregnancies, that will change fuck all about the biological status of women, but it could seriously undermine GC feminism, if we are not careful, as well as all sex-based maternity rights. We need to argue not that it is impossible for a male body to carry a pregnancy, but that it is unethical from the child's point of view and irrelevant as regards women's rights.