On page 221, Saini says, “The question of whether cognition, like skin colour or height, has a genetic basis is one of the most controversial in human biology.”No, it is not controversial. It has been confirmed by 100s of studies.
Coyne explains the errors well, as well as the errors in those who say that race does not exist, or that there are no mental differences between men and women.
Update: Coyne has a technical correction. His main points remain.