A severe case of overgeneralization from a couple of suboptimal questions to an overly broad conclusion. When I give interviews, I try to tailor questions I ask to our environment and to the interviewer's skill set. I've also been in a number of interviews where I was asked interesting and relevant questions. If I were to generalize from my case, I'd say that tech interviews were worthwhile, but that'd be just as dubious conclusion as the author's. We can only conclude so much from anecdotal evidence and personal experience.