Guess you shouldn't read about what synthetic aperture radar systems have been able to do for decades... you can actually make a ghetto radar capable of capturing the data used for this demo with about $350 (in 2012) in materials. But don't worry too much. Their limitations section states that "the operating distance of a radio is dependent on its transmission power" so their system only works reliably up to 40 feet, which is true, but the dominating factor is simply distance, because any signal you get back will be attenuated proportional to 1/r^4. Pumping up the transmitted power to compensate takes a lot of energy that quickly gets you into needing operating licenses. Not to mention moving to using different frequencies that can give higher resolution of whatever you're imaging...

Meh, that seems a little sensationalist. Any significant metal would likely throw this in a loop. You could even buy paint with graphite in it to block weak RF signals outright. IIRC most military bases and data centers protect against this sort of leakage.

They already have your up-to-the-second location and all your private data. All this adds is what pose you're currently making with your body.

Speaking of, I was halfway expecting to see a couple stick figures banging each other behind a wall somewhere in that video. I really think that would have been the frosting on top; they should consider this for the next video when it's time for another round of funding.

The skeletons appear to have very long legs, but no torsos.

I wonder if it was made intentionally that way to make them look less serious.

"Attacks only get better".

No, this research documents information you are already leaking, it isn't taking anything away.