No, it doesn't make any sense. What do you think actually causes the gap? Is it some magical force inherent in white children?
They've shown they can eliminate the gap by addressing environmental issues like nutrition and providing more school time. That would indicate to a logical person that the gap is caused or at least correlated with precisely these deficiencies that were corrected. If other kids don't experience these deficiencies what would make you think more nutrition or more school time could increase their performance?
Why do you go straight to the absurd?
Can you not think of any other factors?
As an example what if poor early childhood nutrition maxes you out at a lower peak?
It is a fair question.
You mean genetics?