A programming language is alive as long as there is one developer using it, doesn't mean it still matters at scale.
As mentioned, Gradle is still around.
Gradle is moving more and more towards kotlin
As mentioned, Gradle is still around.
I see a pretty active community around it and lots of new releases (from the libraries and the language itself) coming up all the time. Your picture of Groovy being dead couldn't be more wrong in my experience.