That's not true, the Android userland is not GNU. It's probably possible to compile some of the GNU tools to work with the bionic libc but it's not the default

That's not true, the Android userland is not GNU. It's probably possible to compile some of the GNU tools to work with the bionic libc but it's not the default userland. I think it's fair to say Android is running on Linux, it's just not GNU/Linux.