It looks like the original text was automatically processed by replacing various words by their synonyms from a thesaurus, leading to hilariously non-idiomatic prose.
The premise is supported by mountains of evidence that IQ (despite being a crude, one-dimensional measure of intelligence) is predictive of intellectual achievements and economic success, in individuals and populations.
Which specific claims from The Bell Curve do you disagree with?
The most contentious point, regarding racial differences in IQ, has been confirmed many times.