I am surprised he posted the video. He sort of got "raked over the coals" from the "heavy-hitters" over at Lift Gamma Gain when he asked them critique it. See: http://liftgammagain.com/forum/index.php?threads/10-bit-vs-8-bit-%E2%80%93-sony-fs5-vs-sony-a7sii-%E2%80%93-is-10-bit-always-better.6657/
Dave even admitted, " ... From the comments here it sounds like I screwed up this video."
As Marc Wileage (a noted colorist) said: "One thing I would argue is that it's hard to demonstrate 8-bit vs. 10-bit online, for the simple reason that 99.9% of all online video and computer displays are 8-bit. But... I think Dave's intentions were good. I'm not of the opinion that if you put 8 gallons of wine in a 10-gallon barrel it'll taste any better. I think once it's stepped on, it's stepped on. However, I think 8-bit video can look acceptable under certain conditions, especially when you're not really having to stretch it out, bend it, or key it."