Not really, it was John Money, paedo doctor sexologist, who made cruel experiments on kids, and changed definition of word "gender", and started gender theory, then some years after few feminist writer used it, but some time later other radical feminists dropped it as inapropriate (as you can not say "oppression is based on sexual reproduction" and at the same time "oppression is based on 'role of a woman' played by women"), and later it was used by genderqueer theoretics, who completely changed meaning of word gender. Sometimes I still see radical feminists believing in this, but most radical feminists (especially GC ones) are against the use of the word and want to abolish it. Nowadays it is mostly liberal feminists who are using it, but liberal feminists are all about men empowerment, I am not sure why they are called feminists at all.