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Seems like it is based on this paper from CVPR 2024:

https://aiotgroup.github.io/Person-in-WiFi-3D/

Frankly I'm shocked it's possible to do this with that level of resolution.

5GHz WiFi has a wavelength of ~6cm and 2.4GHz ~12.5cm. Anything achieving smaller is a result of interferometry or a non WiFi signal. Mentioning this might not add much substance to the conversation, but it felt worth adding.

This resolution is probably enough, as they use human skeleton pose estimators and human movement pattern detectors too.

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