I don't think that they should include the ipod touch. There is no android equivalent. iOS has been out longer too, they will have previous market saturation (android released october 2008 more than a year after iOS). We need to look at the growth numbers.
I like how they can track individual users (scares me).
Why not include the iPod touch? That doesn't even make sense to exclude. It is a portable platform that is on hardware worth more than a majority of Android devices that get counted.