At one point he says something like "of course adult female human beings are women.'
This means that he thinks trans men are women and that nonbinary (notlikeotherigirls) female-bodied people are women! Tut, tut, transphobe Starmer. (The latter two groups would protest this and so, indeed, would the whole faux woke gender movement).
So Starmer doesn't understand what the gender identity ideology actually demands: You CANNOT define any part of womanhood as based on a biological concept. NONE.
Starmer lumps together women who are biological women with women who are biological men but identify as women. These are NOT the same group of individuals in terms of the political issues which affect them.
This is a very common error (a foundational one) inside many of us (I had trouble with this for a few years), perhaps because we are so used to the biological part of womanhood and cannot quite believe that it is going to be erased. So we take the old category (women who are of the female sex) and add it to a new small category of women who are not of the female sex but wish to be seen as women and think that we achieved inclusiveness!
But then we are told that we are excluding the people who excluded themselves by walking out of the group 'women' and who now wish to be called men or nonbinary! They can now not just be added to the large group to preserve inclusiveness: the old group must be renamed. It will be called 'people' as anything else is now not inclusive.