It's not just that particular demo video: almost everything I've seen shows extremely little of the instrument in detail, including all the videos and articles posted as replies here. Almost nothing gives any details on the action, how the action deals with so many differing string heights and wheel contact angles, how tuning is done when affected by both string tension and what appears to be string bending by the action, how voicing is done considering all of this and the wheels... there is no detail at all.
This sadly seems like it might be intentional, too: in http://tygodnik.onet.pl/zmysly/the-da-vinci-tone-in-english/... (also posted elsewhere here), the maker skirts around encouragement to talk about details with the same generalities he uses in the videos, and then outright refuses to discuss details when asked directly beyond talking about the strings going out of tune and volume issues, both matters that are mostly obvious, uninteresting, and not unique to this instrument.
This sadly seems like it might be intentional, too: in http://tygodnik.onet.pl/zmysly/the-da-vinci-tone-in-english/... (also posted elsewhere here), the maker skirts around encouragement to talk about details with the same generalities he uses in the videos, and then outright refuses to discuss details when asked directly beyond talking about the strings going out of tune and volume issues, both matters that are mostly obvious, uninteresting, and not unique to this instrument.