Looks like this uses the native UI toolkits under the hood, making it closer to something like React Native, whereas a PWA is just a chromeless webview with a home screen icon loading a web app.
That’s right. Under the hood, the Hyperview client is built on top of React Native. That means it can be easily extended by creating new RN components, and mapping them to a new XML tag: https://hyperview.org/docs/reference_custom_elements
So many options under that spectrum now. I'm not sure how to decide what to use in the future, hmm.