This is actually like one of the primary tricks of the IQ perverts. They'll take literally any test, run the results through a transformation function to get it into their bell curve, and start making claims about how IQ correlate with This-Or-That based on it.
So: the people that developed intelligence tests were not psychologists; lies, damned lies and statistics; "pioneering" the idea of using math doesn't mean that people using math today are doing the same thing; whatever the definition of IQ might be is irrelevant because "IQ tests" are not rigorously defined; however precisely IQ is defined is also irrelevant because it's supposedly just a proxy for "g"; psychology is not psychometry and so discarding IQ does nothing to the field of psychology.