I was originally considering that as well, but the admin dashboard report only includes page_view_anon, and not page_view_anon_mobile.
With the way this query is now, it is a true mirror of the dashboard report, and you can verify this by running the query and comparing against the dashboard report results.
Which does bring up a different, but related question - should the dashboard report include anonymous mobile pageviews?
Intuitively, I would think yes, but it would be interesting to hear other thoughts about this.