Obviously all is not revealed by the teaser drawing picture.
In side veiw, disc arrangement/stack appears similar to Tesla's.
But the apparent working fluid feeds and exits are distinctly
different as all of Tesla's had holes near centers of discs or
in the shaft istelf to feed or exit fluid depending if pump or
motor desired. If there are no ports in the dicss nor significant
gap at the disc rims to bore then yep a mystery method at work here.
hobot