It should be noted that the intelligence testing industry has itself failed the ultimate intelligence test of producing what they claim to produce.
That worked for a short while until it became plainly obvious that it was factually correct.
So the race and identity grifters shifted their focus from trying to discredit the research to
“given that this is completely accurate , what do we need to do level the playing field to so certain segments of our society that are below average have have the ability to acquire credentials and job functions previously reserved for very high functioning members of society”
This is the basis for the resurgence of affirmative action recruitment and the start of the DEI movement. As a result, we are now dealing with an entire generation of low functioning, marginally competent and poorly qualified people, many with college degrees in Race, Gender and Identity Politics from "elite" Universities in , who are moving into leadership and even C Suite corporate positions.