I see they're also making some dodgy marketing BS statements, like claiming that native-compiling your code "protects" you from reverse-engineering.
They scare-monger that decompiled native code is really hard to understand because it's all native assembler...as if they weren't aware that compilers have existed for many years that compile FROM assembler TO higher-level languages (e.g. C, C++, ... Java).
I don't know if decompiling class files is so a problem when you distribute obfuscated code with a good obfuscator (like mighty bubbles jar).
I've tried JET 3-4 years ago and my conclusion was that it never ran faster then Hotspot and even worst, it ran slower in certain contexts.