This is very different from saying "race being a social construct is an idea of social justice ideology, not of science". She is arguing that the perceived consensus or widespread acceptance of the idea is wrong. You're asserting that "social justice [ideologists]" or sociologists (you seem to be using them interchangeably) themselves came up with the very idea.
We're 15 years later. Is it still a minority position? I honestly don't know. Based on OP, it seems like no, but maybe we're in the same position. But it was clearly never "an idea of social justice ideology, not of science"
> It wasn't a social construct, and its emergence as a recognized concept wasn't motivated by a desire to justify doing horrible things to people
So if our understanding of race was never a social construct, do tell what is the science behind this:
> Finally, I am of opinion that after all these numerous instances I have brought together of negroes of capacity, it would not be difficult to mention entire well-known provinces of Europe, from out of which you would not easily expect to obtain off-hand such good authors, poets, philosophers, and correspondents of the Paris Academy; and on the other hand, there is no so-called savage nation known under the sun which has so much distinguished itself by such examples of perfectibility and original capacity for scientific culture, and thereby attached itself so closely to the most civilized nations of the earth, as the Negro."
I'm not asserting, either, that reasoning around races was used to justify things before the act, but rather that by attributing ideas like "genetics explains people" carries historical consequences. Like that some genes are superior to others. I don't know how you can deny this took place in our history.