Pdf for session is found here, Good Info .
https://docplayer.net/132351658-What-s-new-in-gameplaykit.html
Some sample Code from 2016 available in the Archives:
https://developer.apple.com/library/archive/navigation/?filter=GameplayKit
somos
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This file is available in the 2019 example project for Session 609
Here is the link.
Creating a Game with Reality Composer
https://developer.apple.com/documentation/realitykit/creating_a_game_with_reality_compose
I am able to copy the .rcproject to iPad and look at its contents using the iPad App "Reality Composer"
Also I was able to create one in 2022, (so, you may want to download and use an older version of Xcode!)