It's simply wrong, though, to extrapolate from that to think that four in five smartphones in peoples' hands are Android-powered. Here's the reality: at the time this was written, more than 40% of the smartphones in use in the US (a key market for Nike) were iPhones. Only about 51% of the smartphones in peoples' hands in the US are Android phones. The ratios are more in Android's favour elsewhere, but nowhere outside of China (and perhaps India) would you find four in five smartphone owners using an Android phone.
"Market share" and other phrases can lead you astray. So let's clarify those terms.