Agree. For an SS it is a lot of complexity. Unless it gains efficiency or saves weight, it is just a fun demonstration piece. One YouTube video shows that the rear wheel drops out and leaves the drives in place unmolested, for easy tire repair/wheel-tire swaps.
Lateral forces? Just how narrow (to allow room for the drives = weak) is that rear wheel and how well will it take side forces? BTW the YouTube video of an actual bike has no rotating QR lever.