I think I was fairly specific? There's no way for a user to do vpshufb, aesenc, or a prefetch instruction. One would expect the former two things to be in jdk.incubator.vector, where they are not present. The last thing was explicitly removed, here's a link to one part of the process of it being removed: https://bugs.openjdk.org/browse/JDK-8068977

Code that uses jdk.incubator.vector does not actually get compiled to vector instructions under graal. This is why the top submission that uses jdk.incubator.vector is the only top solution that does not use graal.

I don't doubt that "similar algorithms to simdjson" may be used, but simdjson uses instruction sequences that are impossible to generate using the tools provided.