That is true, for all intents and purposes however the glue code to (insufficiently) reduce marshalling and FFI overhead is written in Java the language, even if it does not use OpenJDK.
Okay, but we're not talking about OpenJDK but about Java, a specification -- not an implementation like the OpenJDK JDK -- that Android has never conformed to and from which it is only growing further apart. I.e. the OpenJDK JDK is an implementation of Java; Android is not (there certainly may be some Java code that happens to behave the same way on Android, but it is not, and has never been, the case for Java code generally). The relationship between Java and Android is similar to that between Linux and Unix -- lots of intended similarities, but there shouldn't be an expectation that a new Linux feature appears in, say, AIX or vice-versa.
At least they were forced to accept how much Android ecosystem depends on Java and now Java 17 LTS is the latest supported version, minus the stuff they never supported like Swing and Java 2D.