CNLohr made a similar project three years before that: https://youtube.com/watch?v=aqqEYz38ens

I know this stuff is dystopic, but I personally find it really cool. That said, I also disable WiFi and prefer ethernet wherever possible...

Imaging like this is like scanning a scene with a one pixel camera. Cameras use a lens to focus an image onto a plane, and the plane has multiple sensors. What would that device look like for microwaves?

(Welcome to HN!)