I guess hearing the tech press, various blogs, etc. it seemed like many Java shops were jumping ship to the greener pastures of languages like Clojure, Kotlin, etc. Actual practice, apparently doesn't always follow the aforementioned sources. :)
There are millions of Java devs. If 1% of them move to a better JVM language that's 10,000+ programmers who have moved. That is a lot of developers jumping ship.
In addition, by jumping ship they really mean starting new development in another language... They aren't rewriting their millions of lines of Java code. So they still maintain this code and as such would still be flagged as Java programmers.