That explains how to screencap a real functioning app and composite it on top of real hardware that's otherwise running exactly the same thing. That is not what is going on here.

According to TNW "Plastc didn’t have a prototype for me to see during a meeting" and what they showed was a UI inside of a fake card.

http://thenextweb.com/apps/2014/10/07/plastc-one-payment-car...