The longer you watch the video the more you see yourself there. The DJ actually put on his headphone when he was meddling the unplugged mixer. He double checked and once all checked out he removed the headphone and shifted his concentration to the laptop.
Do you see the two guys watching him? They represent most of the audiophile who are in search of perfect sound. We look up to someone who supposedly know better than us. Did the DJ trying to mislead? Nope, he genuinely hearing the difference when he turned the knobs. That's know as placebo and that's why DBT is important.