I do not think that a non-technical interviewer would be able to adequately interpret things like how well the candidate found and fixed code smells, or adequa

I do not think that a non-technical interviewer would be able to adequately interpret things like how well the candidate found and fixed code smells, or adequately interpret how well the coder was using their tool of choice, or make meaningful comments on how the user went about testing the code. Proctoring blind interviews might be really interesting, though.