I've gotta second this. Maybe it's just being a grouchy pedant, but this "just" produces a polyglot x86_64 executable with a polyglot program header that rewrites its payload into the appropriate executable format for one of 4/5 supported OSes.

It's extremely impressive, and dare I say useful for several cases, but it isn't really like java unless you squint really hard and pretend virtualization/emulators like QEMU are akin to a JVM, which is the way I understand that claim is supposed to be taken.

I mean, the analogy works, and I respect why the author believes this is more practically useful than Java, but it's like saying (IMO) that Linux binaries are a universal standard because you can just virtualize or emulate a Linux kernel on the cheap, a la Docker for the Desktop or whatever it's called.