Functioning RF power harvesting MCUs have been demonstrated for a number of years now. Obviously there are challenges when the state-of-the-art is pushed forward, but the claims don't seem far fetched.

I worked on a line of wireless energy harvesting based occupancy sensors. It's doable.

Doable and commercially available aren’t the same thing though

Well...I mean we did sell the products so there was a market for them. And yeah, before we released them they were not commercially available...so you got me there ;)

There are a lot of interns working at the company! IDK much about Norway - is that the name for a graduate?

I assume the micro itself is not developed by them given the team size - even with 1 guy looking after this, we're looking at a factor of 30+ in terms of effort to develop, test and certify this type of IC