I'm not saying he shouldn't ask the
question of how much weight URM status really is given by program directors. I'm saying he shouldn't be spouting off his personal, preformed opinion like it's an indisputable fact and like he has any inside knowledge whatsoever about how the admissions process works. He's an applicant. He has no experience on an adcomm and no knowledge of how the process works from the inside. If Maebea or anyone else with adcomm experience wants to confirm what he said, then I'll stand corrected.
I understand the point you're trying to make, but there are at least a few problems with you using those stats to make it. You already pointed one out yourself: these stats are for all MD programs, not just MD/PhDs. We don't know if MD/PhD programs follow the same pattern, and it's not a fair assumption to make that they do based on my other two reasons. Second, I would wager that these stats are not entirely applicable to the schools that we are talking about here because so many of the schools with lower-scoring applicants tend to be schools that are not focused on research. In other words, yeah, if you include schools that are historically black and that historically cater to underserved populations, it's going to bring the overall score averages for blacks way down. But, if you look at the MCAT scores of the relatively few whites or Asians at those schools, they will also be way lower than the averages at the top research schools. In contrast, if you look at the scores of blacks versus other races at a school like Penn, I doubt you will find as much difference in the averages based on race. So just because both blacks and whites got into Meharry with a lower score doesn't mean that the blacks at Penn got in there with lower average scores compared to Penn's average. This is a segue to the third point, which is that you have a serious sample size problem. There are not very many blacks or other URMs in medical school period anywhere outside of the historically black schools. My class is way better than most with 10% black, but we're still only talking about a whole 3 people here (class size 32). If even one of them scored below a 30, that is going to seriously sink the overall average of the black students. I suspect the same thing is true at most if not all of the heavy research schools. There are so few URMs there that it only takes one URM with a below average score for the entire URM average to be below the school average. In contrast, you could have several whites or Asians with scores below average, and their scores would be balanced out by the majority of others that have scores at the average or above average.
My point is that there is entirely too much credit given for the success of URMs solely on their racial background. I mean, Asians score better than whites do on average, right? You showed us the stats yourself. They are also majorly over-represented in medical school compared to their proportion of the general population. So then why do I even see pre-meds posting about how they're not getting in anywhere because there are too many Asians in med school?

Where does the insanity stop? I didn't get into every school I applied to, either. When the rest of you are wondering sometimes why you didn't get into school X or Y, does it ever occur to anyone besides me that maybe they just didn't think I'm a good fit for their school, and there isn't any ulterior motive based on my race? Of course, the thought that maybe you personally just came up short for whatever reason isn't as pleasant to contemplate compared to telling yourself, oh, it must be because person X over there is a URM, and that's why he got in and I didn't.