That sentiment ("any mistake is because they're a DEI hire") is obviously wrong. But didn't DEI open itself up for that accusation by lending it some truth? It's a fact that black doctors have lower GPAs than Asian doctors on average.
I think a lot of people would argue against DEI because it takes the easy way out of a real problem. The result we want is more black doctors, but the way you should get to that is not changing standards that are not inherently racist.