Get this man a nobel prize !
this is the most ingenious thing i have ever seen in the last 10 years.
also the adaptor to put 3 of the folded plugs into an normal one, or share it with a ac to usb power control block is pure genius !!
It should be possible to pass safety standards if the ground pin is solid copper and the power and neutral pin are shrouded to only have the tip be copper.
The rotational part is no problem as it uses friction contacts. so there are no wires that need stretching or shortening.
the only weak spot would be the swivel itself. every time you pull the plug out the entire force lands on the swivel. ( inserting is no problem since the 'wings' spread the pressure over the rotating part.