It seems like the author is setting up a straw man representing the IQ test as some omnipresent (or at least somewhat prevalent) test administered widely. He then lambastes it for all its faults (some of his accusations are correct).

But the reality is that IQ tests are only very, very rarely used. In fact a career on the periphery of academia, academic testing, and their efficacy in predicting academic success at the University level, I have never, not once, not from any colleague or at any conference encountered mention of an IQ test as something to be considered for practical use. I have a lesser degree of familiarity with grade school/high school testing methods, but (in the US) I am similarly unaware of any common practice here.