I would also say several other less known software and data breakthroughs are probably going to also help this tech

1. A world wide localization map that can let the glasses SLAM system do useful things.

2. I believe the Puck runs on a custom OS. The glasses are probably on somekind of a real time Microcontroller driven thing(would be surprised if its much more than firmware, code wise) that needs to efficiently package sensor data and send it over BLE to the puck/wristband. I am not sure they have open sourced those two components.

I hope they open source both of those for public good.