This is the principle. Checking variation of dielectric constant of moving materials and somehow with a huge amount of data processing extract approximate position of some moving objects.

Easy? Not!

https://hackaday.com/2020/10/22/affordable-ground-penetrating-radar/

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No that's the principle behind the noise they discovered under the great pyramids.

It's the same stuff. Radar imaging. Different frequencies, different resolution.

So they are actually detecting phase shifts and shit for the new WiFi thing I saw floating around?

Yes..the data analysis to translate this into useful data is hard. Perhaps they fed this to some AI and train that to do the job. I am more into waves than days analysis