So apart from giving the right answers, you now have to intelligently predict when to give wrong or suboptimal answers to account for the inadequacy of the interviewer? Not that I'm blaming the recruiter here because he/she was just trying to do his/her job, but come on. If I were in his shoes, I would be pissed off not because of failing to land the job but because of being told that I gave the "wrong answers" when they were clearly right.
Dumbing it down and dumbing it down to precisely the words written on a piece of paper are different things. If the "correct" answer were simply any explanation that the interviewee understood, that would be entirely different and considerably more reasonable.
