You know, your arguments wouldn't sound so much in bad faith if you stopped implying IQ detractors were insecure or guilty of wishful thinking, as opposed to simply skeptical of the science behind it, especially in a field that's not exactly well known for the solidity, reproducibility and falsifiability of most of its findings.

All that said, what you said still doesn't contradict Taleb. Being able to (badly) predict a narrow range of outcomes like chess makes IQ a lousy indicator with respect to the ambition of psychometricians to elevate it as the best representative of general intelligence. Or to put it into other terms, if the best you can come up with is that, better drop the whole thing and move on to what actual hard sciences can show us (see the GGGP paper).