wow!..(interesting).. but that is not just a kangaroo, but an ECCENTRIC kangaroo!
however it is NOT required that the hub be re-laced to be off center (fun outcome, but would be a real pain with spoke sizes) - a “normal” kangaroo unicycle simply has one crank moved 180 degrees so that both pedals line up.
EDIT: I found more info in two related topics from 2003 and 2010…