Mixed teams are not a new thing though. There are more of them in sports just recently, but some sports have long had mixed teams, especially at a more recreational level. There have been accepted ways to make those fair from long before transwomen in women's sports was an issue. So in a certain way this is just a continuation of that practice.
But the point is, TW either have an advantage over women or they don't. If it's fair for TW to compete against women in the female category then it is equally fair for a mixed team of 4 men and 4 women to compete against a mixed team of 4 men and 4 TW because they should have no advantage.
Of course it is obvious that TW do have an advantage over women but somehow women are expected to ignore this and be kind, men are allowed to say, hold on, biology...., just proving that men competing is taken seriously, women's sport is seen as a side show to the main event.
Hopefully this hypocrisy will be used in court to make women's sport just for women again.