Having watched a part of that Deebach demo, their strategy and some details have become clearer.
He states that all the sounds are newly sampled, and one emphasis is on achieving a live sound with a lot of pressure, e.g. in the drum samples.
Another thing, and they stretched this nearly to the ridiculous, is a "natural" sound which they intend to achieve by detuned (!) samples, e.g. in case of the very detuned piano he plays during the demo. I think in principle he is right, but this piano really sounds like a western honkytonk, it's too exaggerated.

One important difference between the sound package for the Korg and the Medeli-based MAXX is that the MAXX does NOT have the identical sounds, but uses HARDWARE sound generation, i.e. the filters are hardware-based. He had explained that in a demo in 2015 already, and this means it is not just a Medeli with a different software, but internal parts have been exchanged, too.