I'd like a reference for the 10% IQ claim.

Thing is, if you're a scientist or engineer or other highly skilled professional, a minimum IQ is likely an absolute entry requirement. So if someone claims that success in these fields is only 10% influenced by IQ, the claim would either be false or would be overlooking the fact that IQ got you there in the first place, with other factors being important among a workplace group who are all, say, at least +1 SD from the average.