Intelligent fall detection using TI mmWave radar sensors https://www.youtube.com/watch?v=lsIo_HIk4GY&t=93s
3D Occupancy Sensing For Home and Office https://www.youtube.com/watch?v=9EDhJQbLNyo&t=83s
As you can see the radar doesn't reveal too much, while still being able to discern a lot of what is going on in each scene.
For analogy, take https://en.wikipedia.org/wiki/RANDU: it was very popular in its day, and its distribution looked good to the naked eye, but plot it in more than two dimensions and you see that it’s actually extremely terrible, failing spectral tests badly.
The information has been captured; the fact that one visualisation of it doesn’t expose that information is irrelevant and gravely misleading (as in: I don’t want someone that hasn’t already realised this working on this kind of stuff, because they’re dangerously ignorant and/or naive; I would rather they stop, and go and learn about the risks in detail before continuing).
No, you can't see that, because it's a video of a specific visualisation of the data from one specific sensor.
If it can see through walls and measure biometrics like heart rate, mass and body type, build a 3d point cloud of limb positions and measure vibration, then it's more privacy invasjve than a camera, not less.
if the data were leaked, would you rather have some of your vitals and point cloud data exposed, or a video of you taking a shower?