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Anyone can build a frontend. "Java bytecode" is in that list too. It doesn't mean defacto compilers of these languages rely on LLVM.

In this case it is Azul Zing, a very serious product. It's one of the four major VM Jit compilers (OpenJ9, C2, Graal are the others in my opinion)

There are also PTC, Aicas, Virtenio, Ricoh and Gemalto all targeted to embededded deployments, of which, PTC and Aicas are the most well known ones.

Sadly Excelsior is no more. I imagine that regular JIT compilers making AOT/JIT caches available, is what killed them.