The issue is Vincent never showed how this effects actual games. I like the idea to tuning this, but it had to be supported of scientific method. He has the tools to do it.
He makes an assumption that you want to choose the darkest setting on for blacks, with the assumption that the calibration controls the floor, but then didn't back it up to show that in a game, blacks are now true blacks and not close to black. His assumption could be wrong, the "barely visible" value might actually test and calibrate to your your TVs lowest visible luminance and not the black level.
Not saying i think that, but the video is incomplete without showing it.