This is simply not true. On Surface devices, Windows Hello is a dot projector + IR camera system similar to what Apple does in iPhone and iPad Pro.
Fun fact: for Surface Pro 4 in 2015, they've had to come up with their own custom design of camera modules, because off-the-shelf solutions were too bulky and couldn't fit in a thin tablet. So again, just like Apple but two years earlier.
The coolest feature of Windows Hello is that it allows seamless user switching — computer wakes up, sees face and logs into that user right away. One of the few well-designed things about Windows.