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Xfinity using WiFi signals in your house to detect motion
(www.xfinity.com)
This is a most excellent place for technology news and articles.
Didn't read the article, but it's possible to get a 3d map with wifi. They can probably see you.
There is no privacy or security.
They don't need a 3D map, and the researchers who have rendered a 3D map need a lot of specialized software and resources.
Xfinity doesn't need that. They only need to know when people are online, what they're looking at, and who/how many people are watching TV, and if there's indication of pets in the house. That gives them an advertising gold mine of data.