I remember ski bobs but have never seen a cross between them and a bike. Lots of people who live in the alps use e-bikes to nip into the valley to do their shopping, using the motor to get them back up the side of the mountain. Then they can charge it up at home. Ski bobs are of course great for downhill but they are difficult to control. I should imagine that device is better and of course, will allow someone to pedal uphill. Perhaps the intention is to develop it with an electric drive. There are all sorts of strange vehicles that one sees in the alps. I was a bit surprised to see this electric scooter:
I guess if you were in Sweden, you'd have a skidoo but in the alps, you only want short journeys and the snow on the roads is too thin a layer for them. You want large areas of deep snow, not three inches of snow ice and grit.