Yes, she takes the view that individually some people are smarter than others due to purely random factors, a combinations of variants, she also takes the view that the important variants for intelligence are basically equally distributed among races. Thus the inter racial group differences must be due to racism. The book is an attempt to split the difference and in doing so spells out the explicit biases that must be taken on faith. Which is what makes it interesting. The book as gotten quite a bit of push back on the "some people are smarter than others" aspect which demonstrates that there exist people that believe that some people are not inherently smarter than others. I should have been more explicit on my second message but your response was trite and I assumed in bad faith.
I mean, that's pretty clearly racism.