After spending multiple paragraphs about how they found that they had to dig much deeper into the background of every exec, getting 10+ references from reports, peers, and their managers, and developing specific lists of red flags . . .they end the section with: "Takeaway: Always trust your gut on people. "
Yes, for sure, if you 'gut' tells you something is off about someone, seriously consider and trust that also, but what was really effective was not gut-trusting, but gathering more hard data and observations to evaluate.
Just seems like the author didn't really think it through.