I don't consider Chromebooks a Linux desktop, because normal people don't even know what is Crouton.
They only see a window manager taking care of Chrome instances, with ChromeOS specific APIs.
Google can release a Chromebook without any access to Crouton, replaced the Linux kernel by something else, and no USA school buying Chromebooks would notice.
Same applies to Android, specially after the Android 7 locked on linking to private shared objects.
True, but it also boosts the non-traditional Linux desktop. Something like the Chromebook would be a flop 15 years ago.