Or it shows that there is something about the statistically average black person that makes them less successful than the statistically average asian person. I don't claim to know what the difference is, but this is a fairly obvious inference to make. I'd actually say this is, a priori, a lot more likely than "everyone coincidentally discriminates against these particular racial groups but not any of these other ones".
My suspicion (not based on any hard evidence) is that much of this difference is accounted for by the vast and obvious cultural differences between the average asian person in the US and the average black person in the US. Most Asian (South or East) immigrant cultures in the US aggressively push for educational and professional success. Black culture in the US doesn't.