Yes but the host he's using is Apple Silicon, I think what he's talking about is QEMU using Apple's Hypervisor Framework, which is what vmware Parallels, etc also use nowadays. Booting an apple silicon version of MacOS on non-Apple hardware probably isn't going to possible for a while as it would require emulation.

In 2021 Blackberry, surprisingly, wrote this article about getting emulating the XNU kernel and getting it running on non-apple hardware, but its just a terminal:

https://blogs.blackberry.com/en/2021/05/strong-arming-with-m...

Someone would have to write something that can emulate/abstract the apple iGPU to get anywhere near a usable GUI - I'm no expert but I don't think this is going to happen anytime soon, so when Intel releases of MacOS stop happening apple hardware might be the only way to virtualize MacOS for a while