JDK 9 supports it - however the build and release needs some kind of Oracle-level coordination. I'm not sure if this has anything to do with OpenJDK. But happy to be corrected.
Also there are many Graals so to say, the research being done at Oracle labs, the rewriting of the JVM replacing C++ with Java (Metropolis) and the piecewise integration into the official JDK.
So I don't find it strange to have some kind of Oracle-level coordination.
Yes I do agree it is annoying, but from my humble point of view it is a situation that when everything has moved into the OpenJDK, with AOT compilation supported across all three major desktop OSes, the situation will be sorted out in the meantime.
And we are only speaking of Oracle here, there a few other dozen vendors that most likely will never have something like Graal on their JVMs.
As mentioned on the talk, all the binary downloads with AOT support, have Graal.
When the commercial JDK moves into OpenJDK as planned, that will most certainly no longer be an issue.