I think what we can glean from this is that people are cowards. Of course Nadine Dorries can stand up and say I'm a woman and that's that. Who from her social circle/political circle is going to say 'what about the transgender people?' No-one.
If someone from the left wing does that, they know there is every possibility they will lose their job/their friends etc. Most people will never ever have the balls to do that so they sit there nodding their head and going 'yes yes, everyone who wants to be a woman is a woman, penis or no penis'.
I myself am a teacher, luckily at a school where most of this gender stuff is not an issue (99% of the kids are from Muslim families, so obviously trans stuff would not be a big priority there). But we still get the 'inclusivity' talks, it does feel mainly like lip service, but I nod along, I am not seriously going to risk my career for this. I worked hard to get to even this meagre position, and I don't fancy going back to being skint and struggling.
I'm not going to stand up and say 'transwomen are women'. But I'm also not going to come out as gender critical in a major way and risk my children growing up in poverty. Yes, I am a coward. But I'm also practical.
Maybe if I had a rich husband or family, it would be different.