Heard about this a few months ago and though 'that cant be as it sounds because wireless electricity = massive lightning bolt'
Having looked at the article, isn't that just induction over a larger distance? I did that in yr11 physics

Having more coils on the 'inducee' creates enough voltage / current (cant remember which increases with a step-up) which then allowed us to run it through a small transformer setup and power a light with a ~1 foot gap from the primary circuit and the secondary circuit........ and that was just messing around when we had finished the curriculum