Going to University doesn’t affect IQ much, IQ is not learned.
I have never seen anyone I would consider really smart who took these tests seriously.
Even so, most of the discussions about IQ are about individual scores and a lot of pseudoscience.
I consider myself a person of average intelligence who learned very early on that preparation can set me ahead of the group.
I practiced interviewing, public speaking, coding, writing, test taking, etc, and it's helped immensely. I mean, most tests tip their hand later, which allows you to go back and revise earlier answers. most writing is formulaic, you just have to find a good example. any system that you are evaluated by can be learned.
To prep for grad entrance exams, I wroke up early every Friday, got ready, drove around, sat down and took a timed practice exam at 930 sharp. all to emulate my Friday 900am exam appointment. I got the score I wanted.
"When a measure becomes a target, it ceases to be a good measure" -- Goodhart's Law
QS World University rankings assigns 40% to Academic reputation, and 20% to Citations per faculty, so it's pretty dominant.
I don't even know what that means. That sounds like they'd be ranked only a tenth of a percent lower than US universities, which doesn't jive with the rest of your point.
His premise is that higher education offers little to no value. What theoretical value a higher education might provide is squandered because people are too busy living their lives, namely working to make ends meet, in order to leverage it. This certainly has proven true economically as we can see that incomes held stagnant through the rise of post-secondary attainment, contrary to assumptions of the past that speculated that college graduates would be able to earn more as a result of having a higher education. Similarly, and perhaps related to, he posits the features tested by IQ are not being practiced because people are too busy to carry out that practice.