According to the Aptiquant report released, there was a small cohort of users who used Internet Explorer but was intelligent enough to add the Google Chrome plug-in. As the graph showed, the higher the IQ, the less IE was used with the exception of IE+Chrome. Statistically significant.
As far as the conclusion reached, Aptiquant's underlying motivation may have colored it. Trying to build a webpage that must still meet requirements set by antiquated browsers which are still used by a sizable market must be frustrating, incapacitating and costly.
IBN's counter-arguments were whiningly childish. That is, they never addressed the points Aptiquant raised. They just addressed the IE-low IQ correlation and the pain that must have caused.