On the other hand, if you're a syscall purists and are particular about the dependency on virtualization microprocessor extensions (or the lack thereof), then the stack requiring a hypervisor to run a guest isn't equivalent to the OS it's hosting.
Bottom line is: if you have a shell access/ a terminal emulator on stock Android, you can configure it to run a desktop Linux using the kernel loaded on the device without installing am emulator or hypervisor. To me, this is materially different to WSL or ChromeOS' crostini.