it shares some components. like javascriptcore.

difference is the js - native bridge. for react native it is fixed bridge, that can only change with a change in the binary.

for rollout they can execute any native code with an update of the JS.

The main reason for React Native to not be impacted is that Facebook + Instagram + Airbnb + Soundcloud + ... are using it and Apple cannot justify to their userbase to not accept those favorite apps for a technical reason.

No, it's not. It's because React Native is a totally different technical solution.