That looks pretty clean, but they're still applying looks like 5 patches which would need to be maintained separately. It's certainly not as bad as a full port, but it's still not the same codebase. Rust's cross-platform efforts would (I think?) obviate that process.
But, nevertheless, it's not exactly a port of Coreutils to Windows per se.
For instance, let's take the "cp" utility.
A Windows port "cp" should be able to copy Windows-specific file attributes. Does the Cygwin "cp" do that? How about NTFS forks?
I don't believe that you can write some portable code in Rust, and have a "cp" utility which correctly handles every quirk of every OS's file structure.
