There's no evidence that this is true. Even if you take the extreme position (against which there is plenty of data) that different ethnic groups are more or less identically "genetically" capable at a group level, both in terms of the average member as well as the outliers, the fact that different groups have different cultural values and practices mean that those differences play out in considerable differences in results. And those differences get even more exaggerated at the outlying levels.

For example, the US population is roughly 14% black and 6% Asian, but among NFL players, it's 58% black and a 0.1% Asian. Even if you assume no group-level differences in inborn ability and potential, the fact that football is a much bigger part of black American culture than it is Asian American culture would mean that after generations of such cultural differences, you will end up with such a skewed distribution.

In real life, of course, there are group-level differences at the genetic level, which compound into culture and over time result in wildly different outcomes for members of those groups. Over nine-tenths of the world's top sprinters are of West African descent; same for the marathon and people of East African descent. You might easily imagine that a group of people composed of those who naturally run fast will develop cultural customs that involve running, which further develops the talent pool in that group.

Apply that over generations, and it results in such a big difference between groups that a naive observer concludes that external causes (i.e. racism) is the most reasonable explanation, coming from the faulty assumption that group-level differences do not exist outside of such external causes.

In fact, I would go a step further a claim that it's virtually impossible to take a subgroup of a broader population that precisely reflects the composition of the latter, along any lines.