Earlier quoted context omitted.
Natural differences are things like 'mean height', and the ability to get pregnant. It is quite reasonable that past societies divided labor based on suitability of physical capacities for different tasks. It wouldn't be reasonable to call this 'oppression' per se. However the structure of roles human societies has always been mediated by the level of technology. Gender divisions of labor, class and caste systems etc…
Think about that history affected our biology (due to evolution). Consider the case with food. We now have an abundance of food rich with carbs and fats, but if we eat too much of them we get sick, because our bodies were designed with certain assumptions about environment. In this case, or natural environment. Wouldn't the same be applicable to our social environment? Also, technology is not permanent. Consider what…
At least it's clear what kind of logic you are using.