Golden rule of digital pianos:
If a DP doesn't proudly state how many gigabytes of sample ROM it uses in spec page, it's most likely really, really bad.
If you make a sample based piano - as most DPs on the market are - fundamentally a romplers - and you use 8 or 16gigs of sample memory or more, you would proudly state it, wouldn't you.
Especially, since most of the products on the market use waaay less.
Even if you used as little as 4gigs of sample memory, that would be rather notable considering how little sample memory competing products use even in the current year, regardless of price bracket.
But they don't state it - and you can hear it too - in every video.
It's probably something so embarassing that they'd rather not say.
For, example Kawai MP11 uses, if I recall correctly, 320megs of total sample wav rom.
Yamaha N1X uses 1 gigabyte, etc.
It's not a real product review if it doesn't take a screwdriver to it, and doesn't open it up to find out. Eventually someone will, and then we'll find out if it's 512megs or 1gig (or maybe its 2 gig?).