I’m certainly not an Android expert, but it’s quite clear that Dalvik was a traditional JVM with interpreter and later a JIT compiler. The newer Android Runtime ART does compile the Java bytecode to native machine code ahead of time, but the most apps are still shipped as Java bytecode. ART does not ship with an included Dalvik JVM.
Anyway, using Dalvik or Alien Dalvik as base for the recent Sailfish Android App Support would be rather pointless. No small company has the resources to backport all features to such an outdated architecture to support Android >=5 on Dalvik. There is no indication that “Jolla has taken over Alien Dalvik”.