Firstly, I think (though I could be wrong) that when they talk about privacy concerns they mean the sort of concerns the average person would have about having a camera about... I.e. naked or compromising pictures of themselves getting leaked. I would guess this wouldn't be a problem with radar as it doesn't create images.
Out of curiosity though, not having much knowledge on the subject myself, what would be your security concerns? I would be genuinely interested in knowing what we should be looking out for, privacy wise, with such technology.
Don’t confuse privacy with secrecy. I know what you do in the bathroom, but you still close the door. That’s because you want privacy, not secrecy. (From I have nothing to hide. Why should I care about my privacy? : https://medium.com/@FabioAEsteves/i-have-nothing-to-hide-why...)
But privacy is relevant here. Easy example: a person whispering,their private conversation no loses it's privacy due to lip movements being read. Two people enter a room and exchange an item for cash,with radar their transaction loses privacy.
Emotional manipulation. Using radar to detect emotional states with 70% accuracy for the general public was achieved 2 years ago by the EQ Radio team at MIT.
They did this by detecting breathing & heart rate at a level of accuracy on par with wired sensors.
This tech works through walls for multiple people at a time, whether they're sitting still or moving.
The world is not emotionally responsible enough to protect against this tech.
If the technology were fetishised, the tech itself would acquire the status of fetish, which isn't the same as the tech being used to ends of fulfilling a fetish (e.g voyeurism). Some brands arguably promote technology fetishism, but fetishism isn't necessarily sexual, for instance the theory of commodity fetishism.
Radar can create images just not true to life color photos. But, leak such a photo of a couple in their bedroom with the blinds closed and you have a problem.
If you mean from the inside that’s a question of contrast. Look at a tv in a dark room through one side of a t-shirt a few inches from your face and it’s a non issue. Try the same while the side facing you is well lit and it does not work.
Under some situations you can see through thin cloth blinds like this from the outside, but that’s mostly poor blind choices.
It's actually a blind on my backporch similar to this: https://images-na.ssl-images-amazon.com/images/I/71rijF9vnlL... , but it has tiny gaps in-between each slats... I could see through the blind when I was zoomed in to 300mm while being a meter away from it... I could see my neighbor's house and the slats were invisible in the picture. Kind of creepy but I don't have this camera anymore so I cannot do anymore tests...
Out of curiosity though, not having much knowledge on the subject myself, what would be your security concerns? I would be genuinely interested in knowing what we should be looking out for, privacy wise, with such technology.