Unfortunately I have found the same phenomena inside Olympic Lifting. There have been Commonwealth Games level Nigerian Sprinters both male and female adopt OL in Sydney. This sport is heavily represented by Eastern Europeans, Greeks, Turks, and Iranians. One of the earliest remarks was that Nigerians don’t make good OL. These athletes got overlooked in training and subsequently left the sport. Definitely the reverse happens with West African athletes within OL in this instance. Could I suggest that a similar phenomena happens with black swimmers?
Most of the evidence which supports the genetic advantage of race for sprinting is based on misinterpretations of anthropometric data. It’s not the anthropometrist who propose these racial advantages. Level 4 Criterion Anthropmetrist have many years of experience in the field with a high level of theoretical knowledge, most have been involved in athropometric projects and have publications in anthropometry. The Level 4 Criterion Anthropmetrist would not be so ignorant to propose racial advantages for sport based on their data. Sprinting is multifaceted - biomechanical, physiological and skill traits are just as significant.
Its mostly the less learned who forward these dogmatic divisive points of racial advantage.