Op, as others have said, the term gender has historically meant sex role stereotypes. Not just expected, but imposed.
And they have been used to disadvantage women.
For instance, women were considered too unaware to vote. They were considered too fluffy brained to educate to a professional level. They were not allowed to have their own mortgage, because they are irresponsible with money, or their own bank accounts.
Hell, as late as the early 1980s it was perfectly legal to refuse to serve an unaccompanied woman alcohol in a pub. She wasn't considered responsible enough. Or it was somehow 'inappropriate'.
And until 1992, rape within marriage was perfectly legal. Because let's face it, a woman's role is to provide sex, whether she consents or not.
So, irresponsible with money and alcohol, fluffy brained, not worth educating, doesn't understand governance, and expected to be ornamental and provide sex.
These are sex role stereotypes - gender. And they have been used, historically, to keep women powerless and oppressed.
That's why you will find feminists who call themselves gender critical. Being critical of those expected gender roles is a cornerstone of feminism.
What's the saying? Women are oppressed because of their sex, and gender is the way it's done.
These stereotypes which disadvantage women are clearly not innate. There's not an 'innate gender' that explains women's oppression.
it's imposed, by a sexist society.
And the greatest proponents of that sexist cohort are men who call themselves women, because they are aroused by the fetishisation of women's oppression.
The concept of an innate propensity for stereotyping is highly detrimental to women, and the men who fetishise it so vehemently are the ones driving it.