Yes, in a world where those two groups have the exact same make up, it would mean that. That's not true at all in this context. There are differences between racial groups. No one is shocked and appalled that Jewish people are hugely over represented as Nobel prize winners, or that black people are wildly over represented in professional sports. It's difficult to disentangle what is just cultural impact, but they're patterns that a child could identify.

If you work from a false premise, you end up with false results. The motivation behind the desire to believe that everyone is equally capable at everything is a good one, and individuals should be treated as if they have equal potential regardless of their immutable characteristics. It would be great if all groups were great at everything. If it were possible, I would make it so. However, falling prey to treating "ought" as "is" leads to pathological behaviors, which is exactly what is happening to the well-intentioned members of this movement.