Here is the video in question: https://www.youtube.com/watch?v=kPMHcanq0xM It doesn't have any disclaimers that this was faked -- some earlier videos from Magic Leap did have disclaimers.
It is obviously too high resolution and pixel perfect to be from a headset display though. So it didn't fool me, but I think the way it is presented could be quite misleading to folks without a 3D background.