Why bang on about Apple and LIDAR
when at the end he just mentions intel and camera inside out tracking?
It's also on the market now and a lot cheaper than an iphone plus (the one with the sensor) - the Meta Quest 2 does it quite well for £300!
If you dislike Facebook there's a really nice open source product on it way shortly the Lynx platform https://www.lynx-r.com/
I'd love Lidar to become really popular as it's very accurate but also expensive, I think more will just use normal cameras as its a fraction of the cost. But yeah Tracking happens!