prior to this Chrome OS VPN update, I could install VPN apps in Android, but the VPN tunnel would only be accessible through other Android apps.
so I needed to install chrome for android in addition to just running the Chrome OS Chrome browser in order to browse intranet websites only accessible via VPN tunnel
I'm now running latest Chrome OS with the VPN changes
confirmed that all traffic flows through the Android VPN tunnel now
I'm able to access VPN internal websites from the ChromeOS browser
discussion on reddit: https://www.reddit.com/r/Android/comments/71ce5l/google_is_preparing_for_tighter_androidchrome_os/
original article: https://www.xda-developers.com/chrome-os-android-vpn-integration/