You've stated 'data shows'. So my question was - was it a proper double blind study? Because it is definitely possible to do it properly. Substitute the result

You've stated 'data shows'. So my question was - was it a proper double blind study? Because it is definitely possible to do it properly. Substitute the results (or partial results) of the interview with rnd(), use it for hiring decision for a subset of candidates. Keep this information confidential. Establish if parts of your interview process don't perform better than randomness a few years down the line. It's possible to do. Only I don't think this was done. And if it was not done, and the method was some 'data shows' with hand-waving - it would be under definition of pseudoscience.