IQ is playing here is that of a quasi-objective Outside View measure of a person's ability to be correct and rational.

FYI IQ, whatever it measures, has little to no correlation with either epistemic or instrumental rationality, For extensive discussion of this topic see Keith Stanovich's What Intelligence Tests Miss

In brief, intelligence (as measured by an IQ test), epistemic rationality (the ability to form correct models of the world), and instrumental rationality (the ability to define and carry out effective plans for achieving ones goals) are three different things. A high score on an IQ test does not correlate with enhanced epistemic or instrumental rationality.

For examples, of the lack of correlation between IQ and epistemic rationality, consider the very smart folks you have likely met who have gotten themselves wrapped up in incredibly complex and intellectually challenging belief systems that do not match the world we live in: Objectivism, Larouchism, Scientology, apologetics, etc.

For examples of the lack of correlation between IQ and instrumental rationality, consider the very smart folks you have likely met who cannot get out of their parents basement, and whose impact on the world is limited to posting long threads on Internet forums and playing WoW.