My critique is he makes one assertion and backs it up with style instead of actually developing or analyzing it. He takes a single basic observation and uses it an a blunt instrument. Sellers set prices. Brilliant observation. Don't bother looking into why, just feel upset about it.
It's like he sees an apple fall from a tree to the ground and declares "That tree threw an apple at the ground, trees hate the ground!" Ignoring outside forces completely.
He's not wrong on individual points, but the whole thing is incredibly myopic.