You start with the article of faith that he must be wrong and there cannot be unequal distributions of intelligence across different racial groups and between the genders. Then you hear or read others call it "pseudoscience" and repeat what you have been told. And you're an academic. Do you label your colleagues who believe in "unconscious bias" as believers in pseudoscience? It's exactly that and there are now numerous studies demonstrating this. How about your colleagues who believe there are more than two genders? Pseudoscientists?
This is a an actual example of cognitive dissonance: "Intelligence is not distributed equally." Next breath: "Intelligence is distributed equally across immutable categories of people."
The thing is that the more that people like you steadfastly refuse to acknowledge the reality, the more you stoke the fires for the racists that you claim to revile. If you instead offered something intelligent and sober, like: "Yes, there are variations in IQ distribution between racial groups, but there are greater variations among individuals, and, regardless, IQ differences don't render one group 'inferior' in their humanity and ultimate worth than any other group," you would disarm much of the venom from that side. Instead, when you deny something as obvious as the observation that Asians tend to be blessed with more intelligence than other racial groups, which probably explains their overrepresentation in elite universities and more rigorous majors, despite historical discrimination, people on the opposite pole dig in their heels even more and become more strident and hyperbolic in their claims of biological determinism.