Not correct. Face ID will work from multiple angles and distances when a device is held at a natural angle, but it needs to see your face."It's quite similar to the ranges you'd be at if you put your phone in front facing camera mode [to take a picture]," says Federighi. Once your space from eyes to mouth come into view that would be the matching range - it can work at fairly extreme angles -- if it's down low because your phone is in your lap it can unlock it as long as it can see those features. Basically, If you're using your phone across a natural series of angles it can unlock it." (
https://www.macrumors.com/2017/09/15/craig-federighi-face-id-interview/)
I tested it. I was able to unlock and use it while it was flat on my desk, but the camera was not seeing any part of my face. Just the ceiling.