Can we stop calling Android Linux just because it shares the Linux kernel? Obviously the author was referring to a GNU/Linux distro.
It's just like saying "this human and this bacteria are the same, they have a DNA with the same chemical structure !".
I'd be interested to see the answer for an out of the box Ubuntu distribution (latest stable version), as well as the answer for Red Hat Enterprise Linux, to cover the "leading brands" for the consumer and business markets.
I think it's fair to say Android is running on Linux, it's just not GNU/Linux.