Hello? Is this a tech publication?
The hardware industry raced to compensate for Android's inefficiencies (as you'd expect from an interpeted Java-based OS)
As is the custom, the OS has been compiled to the CPU instruction set and is not written in Java.
There is used to be Dalvik VM in the software stack, yes (i.e. it runs "dex" bytecode which is unlike the one of the Sun/Oracle JVM). Now replaced by something imaginatively called ART, the "Android Runtime", another VM (they really missed the occasion to call it Dalghren)