Long but a very good blog post. I largely agree with all the conclusions and similarly wish Rust would go in a better direction with regards to certain features, especially compile-time reflection.
I also sadly agree with the comments on the Rust leadership. My personal experience with contributing to Rust has not been great, though I haven't tried very hard (but exactly because the initial feeling was not great).
I think it is because Windows has many subsystems, it's just that you don't hear about most of them aside from WSL.
So it is referring to the particular Windows Subsystem (of which there are many) that can run or emulate Linux.