I read the report. They didn't even aim for representative sampling of interviewees and clearly over-sampled those who belong to various gender identity organisations. This means that the responses they received are unlikely to be informative of all the relevant concerns.
The word 'gender' is almost completely undefined in the report, though we are told that it would certainly have self-identification as one part, but perhaps amended with other characteristics, depending on the specific context. Even biological sex could be one of those additional aspects of gender!
In some parts the report uses 'gender' and 'sex' as referring to the same concept while in other parts it distinguishes between the two and privileges 'gender.' But a concept which cannot be defined, which is argued to be fluid and changing (though they speculate, in a footnote, that some argue sex is also changing over one's lifetime) cannot be seen as if it will be used in discrimination cases the same way 'race' or 'sexual orientation' is used. They justify deleting the concept of legal sex because there is no concept of legal race or legal sexual orientation, though they also argue that sexual orientation should be replaced by gender orientation.
They play little lip service to the idea that women, as a sex, could be handicapped in all this, and they also passingly mention that changes such as removing 'mother' and replacing it by 'gestational parent' (which they support) are overwhelmingly done only to words referring to the female sex. I have yet to see 'impregnating parent' in any context whatsoever. This new ideology is deeply sexist and rather open about it.
The justifications they make for the project of erasing legal sex are, in addition to the usual trans arguments, that not having legal sex would somehow stop parents from bringing their sons and daughters up differently and would somehow magically start erasing sexism and misogyny.
If that was true, we should no longer see any racism or homophobia, given that neither race nor sexual orientation is mentioned in passports etc.