From what I understand the P95 and P85 piano sample is one velocity layer with filtering to change the timbre. The Privias do have 3 or 4 velocity layers as well as some filtering, so the video appears to be accurate. However, I would reject the videos conclusion that this automatically makes the PX-130 the superior instrument. Well, I do think it's the better instrument at that price point, honestly. Yamaha lives off the reputation of their more expensive instruments (which blow any Casio away to be sure) but the cheaper ones are not of the same caliber. But you shouldn't pick an instrument simply based on who has the most velocity layers.
Topic: Yamaha versus Casio - Video