That data is from mid 2011. The difference should be much smaller now, if there is any. Android had like 150-200 million devices back then. Now it has over 500 million.

This is why this article is BS, because most of the data used in it is extremely irrelevant for the Android ecosystem right now. This article should've been written in 2011. Not at the end of 2012. The Android ecosystem has grown and improved a lot since then.