> They neither qualify him nor disqualify him. Correctly or near correctly answered trivia questions tell you almost nothing about a candidate other than that they're probably a software engineer of some kind.

Please read the entire sentence you quoted halfway - by "interview performance" I don't mean the correctness of the answers, I mean his a) expectation that UNIX trivia quizzes are a normal part of a director-level interview (and that it's not more likely that there was a miscommunication in scheduling) and b) attitude.