Racist.
Yep. The comment is both racist and extremely unhelpful.
Pick any two groups. Perhaps two nationalities. Or two professions. The chances of the two groups having the same average IQs is low. What would be the point of broadcasting the data from the lower group? How would that help anything? All it can do is divide.
Now here’s what would be helpful: saying that urban blacks are very underserved by public education. And I say that as a retired urban public school teacher. The system demands little. So way too many black kids do little.
That sets them up for a life of failure.