I actually believe this to be true. People with high IQ usually are highly neurotic and understand/see the risk involved in any venture. This often leads to paralysis by analysis. Lower IQ don't always see the risk so they just go for it. Ignorance is bliss at times.
I think what they are saying here is that EQ is not real. Also agreeableness and neuroticism are separate. EQ is basically agreeableness, not neuroticism. You are right that High IQ is correlated with neuroticism tho, even higher than agreeeableness.