[defen]

Have you considered that the demo may have been faked (for example maybe they preprogrammed it with room geometry that was acquired some other way)?

[lostgame]

From what I understand - the demo was using a completely different set of technology from that which eventually came out.

[leetrout]

It had been proposed that this may be one way some of this tech gets adopted- purpose built and maintained rooms just for AR / VR / XR.

Its not a baf ifea if you have the right tradeoffs. The tech to make that worth it is going to be at least a decade away IMO.