I'm not sure if you're agreeing or disagreeing with me? Yes of course there are various definitions and measurement methods of 'IQ' and 'intelligence' and one can define all of them in various ways. Exact definitions aren't interesting for the current purposes. What I said was, some people are smarter than others, even when considering orthogonal traits. If we hypothetically consider 'intelligence' as a combination of trait A, B and C, and we choose A, B and C carefully enough so that we can score or normalize each of them to a scale of 0-10, then Alice with a score of 8 on each of them is more intelligent than Bob who scores 4 on each of them. Now in the margin you can argue who is more intelligent when the scores are 5-8-4 and 5-4-8 but that doesn't take away from the point.

It's not like we're talking about one specific methodology for measuring IQ. The whole argument is in the context of the OP arguing that correcting for intelligence is necessary for making a meaningful comparison between wages earned (basically, it's discounting for opportunity cost). Which is totally reasonable and obvious.