The title says that smarter people do worse, which is correct in the sense that their relative performance is 20% worse than less numerically inclined people. They cover this in the latter half of the video. However, in order to believe this was the title’s intent, you would have to assume the title should have read, “Smarter people score worse on political numerical questions than on apolitical numerical questions.” Realistically it’s so ambiguous that any interpretation is plausible.