His edge retention "test" shows there's not that much difference, and a $40 knife is ok relatively to the more expensive one. But S30V is one of the main reasons why PM2 is more expensive, and this steel really makes a difference. In my experience, in terms of edge retention, any super steel is much better than a cheaper steel. While AUS8 dulls very fast from light use, CTS XHP, S30V, S35VN, M390 etc. take forever to dull. I have knives I never sharpened because they are still sharp.

P.S. Maybe we should be less serious about this video. But the author told it's not a joke, so I don't know if he's serious or still joking.