Greedy reductionism strikes again.
"Greedy reductionism" implies explaining-away the data on the basis of a reductionist theory; e.g. Skinner's explaining-away of the experience of consciousness.
The only thing being explained away here is the "political correctness" explanation, not the data.
Also the two explanations aren't mutually exclusive.
Conditioning on one of two independently sufficient causes detracts from the other's plausibility.
ETA: The table linked by Landsburg has been called into serious question by Evan Soltas [H.T. CronoDAS]. I edited the post to leave only the table to provide context for the comment discussion of its status.
Economist Steve Landsburg has a post [H.T. David Henderson] about the supposed stagnation of median wages in the United States in recent decades. In the linked table median wages have risen for: