React native runs in the native ecosystem through a js-native-bridge and calls platform specifics system calls.
https://reactnative.dev/architecture/xplat-implementation
react is the <Components /> stuff in js
react-dom is the juice
Good find, when I read it I called bullshit but I got lost trying to understand the diagrams.
Another gotcha is the semantic decoder, they are just looping the model on itself "A cozy teddy bear" + fMRI random input => A teddy bear!!!