Sorry, but Tesla’s great vision was built around using natural electromagnetic energy (I think geomagnetism) to power a vast worldwide electrical grid.
This energy-scavenging technology is designed to tap manmade electromagnetic fields to power small milliwatt sensors. Hardly the same thing.
“Hardly the same thing.”
Uhhhhh! I know that! But he would have enjoyed it immensely. Right up his alley, so to speak. And probably would have come up with the tech a long time ago!