Let’s say transgender athletes pour into women’s sport, and let’s say, despite the flimsy and poorly-understood relationship between testosterone and elite performance, they dominate everything they touch. They sweep up Grand Slam tennis titles and cycling world championships. They monopolise the Olympics. They fill our football and cricket and netball teams. Why would that be bad? Really? Imagine the power of a trans child or teenager seeing a trans athlete on the top step of the Olympic podium. In a way, it would be inspiring.
Why is he so excited at this thought? A clue to his outlook is when he writes of "the inviolable rights of trans women to live however they choose and call themselves whatever they want". That's in line with the state ideology we all live under, namely the liberal idea that individual autonomy - a freedom to be self-determined in every respect, so that the "good" is simply what we desire or will as individuals - should be the overriding principle.
Our sex is something that is predetermined rather than self-determined. Therefore, liberals will see it as a potential limitation on our freedom as autonomous individuals. They will also see "trans women" as asserting a freedom and a right, as Liew puts it, of living "however they choose".
If this means that women get defeated in sporting events, then that's a price that Liew is willing to pay.
You have to remember that to have someone who is biologically male choosing to override this predetermined fact of existence in order to choose to live as a female is a very strong manifestation of liberal morality. We shouldn't be surprised if this is thought to trump other considerations, such as women in sport.
There are some feminists who don't like the idea of biological men who identify as women taking over female spaces (sometimes called "Terfs"). But they are in a poor position to defend their position, given that feminists have also pushed the liberal line for many decades, arguing that individual autonomy is what matters most, and that therefore the sex we are born into should be made not to matter, and that any attempt to link our biological sex to masculine or feminine attributes is to be condemned as "gender essentialism".
It will be interesting to see how this unfolds in the coming years. There will have to be women who will resent biological males dominating female spaces. But on what grounds will they object?