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As far as I know the backend to have the driver running on macos is already merged in mesa, so it should already work as-is?

So ARM Macs in OSX can now or soon have true Vulkan support with just a custom userspace app code targetting the kernel interface directly?

I don't think the vulkan driver exists in a usable state yet. So far there's only an OpenGL driver.

No. As the article says, the macOS kernel interface is an undocumented, moving target.