An alternative explanation for anyone who's still confused: it's one of Windows's potentially many subsystems -- i.e., it's Windows's Linux Subsystem -- and hen

An alternative explanation for anyone who's still confused: it's one of Windows's potentially many subsystems -- i.e., it's Windows's Linux Subsystem -- and hence it's the Linux Subsystem for Windows, not the Windows Subsystem for Linux. That said, I think their interpretation was likely different: it's the =Windows subsystem that is meant for Linux, kind of like how earlier they had SUA, the (Windows) Subsystem (meant) for Unix-based Applications.