That’s a feature of the headset, but I think some of the demo videos were recorded in some other manor. I seem to remember hearing a discussion on a podcast (The Talk Show? Dithering?) where it was mentioned you could see a camera rig somehow.

Perhaps that was something you could see on TV when they accidentally showed the rig that was at the same event?

Of course it’s possible they were only using a camera rig so that no one would see the device before they were ready to invade it. Which would be very Apple like.

So I’m speculating a bit. But even if they were going to professionally record events I would think they would do better than just have someone sit there with a headset on.