If you remove some of the wording/constructs that IW uses, I agree with some of her sentiments......
There is a world of difference between people who suffer from gender dysphoria and everybody else who places themselves under the trans umberalla.
The broadening of the trans umbrella throws people with GD under the bus alongside some systems put in place to support them.
Many trans identities involve completely divorcing sex and gender, others depend on sex and gender bring conflated and certain trans people's interests conflict with other trans people's.
I actually think that the more society is forced to cater for the full range of trans identities, the less threat this could present to women and girls. Provision of gender neutral services alongside sex based provision would work for all but mtf and ftm trans people. I expect this is what upsets IW so much.