I had the exact same thought. I almost didn't bother following the link, because Rust for Windows is already a thing, but this is essentially a Rust equivalent to C++/WinRT.
To be clear, it's a bit broader than that. WinRT is a specific subset of windows APIs, and the Rust bindings for that have existed for a while. This is for all Windows APIs.
I thought your comment was a tongue-in-cheek reference to Windows Subsystem for Linux and then I clicked the link.
At least they are consistent in using the convection in reverse.
No more backwards than Windows Subsystem for Linux!