It appears to have been an accident now - they fixed the issue two hours after I posted on Reddit.
Curious if you get any sort of takedown notice.
Haven't received it yet.
the page is dmca unavailable on github now as i write this message
It's not a bug! Websites are supposed to have human-readable markup and scripts.
the sourcemap has been removed and repos DMCAd
The web version of the App Store? It's always been web and webview based, there used to be a preferences/default command to enable web inspector for App store, Music and more Apple apps on MacOS.
Nowadays it's all AppKit/UIKit/SwiftUI. It's no longer a webview.