Is it? The article states previous quarter. Q1 2011, no?
Usually, these firms compare same quarters. Q2 2010 to Q2 2011. The article does state previous quarter, so you're right, they could mean Q1 2011 (I took it to mean the "previous" Q2, which would be 2010). But then again, that would also be weird as Honeycomb tablets weren't yet introduced in Q1 2011, so a sharp decline from Q4 2010 would be quite unexplainable at that point.