How to fudge numbers
"Why not include the white-label tablets? Because only seven million of them shipped during Q1, compared to 40.6 million branded products."
Or, in other words, if you count all the tablets shipped, Android has 52% and Apple has 41%. But, if you don't count about a third of the Android tables shipped but still count all of Apple's, then Apple sold more. Just.
It's a good trick, and one you can apply almost anywhere. The UK has a bigger land mass than the United States, so long as you don't count the "Continental" parts of the USA. And the UK has more people than China, so long as you don't count the Chinese who live "outside Beijing."
And, FYI, for native English speakers, calling someone a "niche player" is not quite the same thing as saying they are carving out a niche - one is a nice way of saying you're irrelevant, the other means a modest success.