I disagree. I've never been in an "Android shop", and still seen plenty of Kotlin code (all the places I mentioned mainly had React Native apps). You have some preconceptions that probably aren't correct, and try to make all reports fit that narrative. Just accept that lots of people use Kotlin without having anything to do with Android.

Like all guest languages on the JVM, its domain outside godfathers' mobile Kingdom won't move the needle to rewrite the Java ecosystem.