No one says that, except those trying to misrepresent the argument.

The argument is that more women prefer other fields, which are more people-oriented, to some STEM fields that are more object and abstract-oriented, and when they have a choice, go with their preferences.

There will alwasys be those that prefer and excel in those STEM fields too, just don't expect parity, any more than in auto mechanics, plumbing, nursing or school teaching.