It's hilarious, because essentialism has nothing to bloody do with biology.
The idea that there is a core, or essence of humanity beyond our material bodies - 'I think, therefore I am', is at its root. And this idea of a core, unified, rational subject had started to break down by the mid-nineteenth century. Although this breakdown is often placed with the mid-20th-century existentialists it in fact started long before this and had certainly taken root strongly by the 1890s.
Essentialism is the gendered idea that women are nurturers, carers, support humans etc - gendered attributes arbitrarily attached to our sex and accepted as 'natural, common-sense' discourse. What it is not, is the biololgical fact that we have a vag and tits.
Are these people really as stupid and uninformed as they appear? (Disclaimer: that was a rhetorical question) 😖