The results don't seem that surprising. Even though Android was outselling iOS, I believe that around that time the overall install base for both platforms were fairly similar. Android has likely since gone on to surpass iOS (which does include the iPad so the comparison becomes somewhat more muddy) so the results may have changed.
I don't expect that the results have changed much. My mom recently got an Android phone when her old dumb phone died, but she doesn't use any of the smart features and really doesn't care about them. I imagine that there are a lot of other people who also picked up free or cheap Android phones in place of a dumb phone when upgrading, but don't use it any differently than their dumb phone. Those people are going to pad Android's numbers but contribute nothing to web or app usage statistics.
Apple really hasn't had this problem as until recently they weren't offering any iPhones for free with contract so the people who were just after a free phone weren't going to buy an iPhone. Now that they have a model for free, perhaps that trend will change.
This was my point before. People who buy an iPhone buy it to use it. A lot of Android users are simply people trading for free phones. This is why when I walk around in San Francisco's Financial District, and sit in a random coffee shop, I could easily be 1 of two Android users out of 10 total people, with the rest using Apple iPhones.
Almost everyone who I know that has an iPhone uses Facebook and Instagram and Twitter actively. They're browsing, consuming media, etc. People my age who have Android phones do similar things, but I can speak for a lot of older people like parents who have Android phones but do nothing at all on them.
One thing skewing mobile browsing in Android's favor is the fact that iOS stuff has apps. I almost NEVER open the web browser on my iPod Touch, and I believe that was the same when I was using an iPad. Compare this to my Android phone where I find that I need the web version of a lot of things. Sure things have gotten better, but I think many Android users up til maybe 6 months ago when they redesigned the FB app remember that touch.facebook.com was better than that horrendous mobile app.
So yeah, there's things skewing statistics both ways. Maybe data consumption as a function of OS type is a better indication of smartphone usage?
Honestly, my two cents is that my iPod Touch is very smooth in scrolling and after loading websites. My SGS2 does fine too, but my single core phones don't hold a candle to the iPod Touch. When people say that their browsing is nice on their Android phone, remember that it took you 2 or 4 cores and massive memory to get basic tasks to work well. Meanwhile the iPod Touch 1G is still doing fine loading websites.
Remember when computers had 128mb of RAM and we loaded websites too? Now Firefox can gobble 1gb of memory easily and we still think browsers are slow. What has changed? And if anything Flash has seen a downfall since 10 years ago so there's no point in citing flash. Software is just getting more bloated.