Interesting article... I see this also. Especially where the app is in open use.. by that I mean on general release on appstores, We are however seeing the reverse with apps focused on enterprise mobility apps.. where the business can control what devices the app will run on... the total cost (app and hardware) is actually less where the app is running on hundreds of company android devices.
http://www.kumulos.com/2015/10/28/is-apple-losing-its-shine-...
We are seeing a swing away from iOS in favor of Android (and even Windows), largely driven by the total cost argument.
weird. In my experience in a team with 10 android engineers & 10 iOS ones, for most projects development takes pretty much as long on both platforms.
Of course there are many exceptions, like many features that can only be written on one platform or slightly different designs that leads to very different technical challenges.
For very hardware relient apps (like a Camera), I suspect that Android can take substantially longer, but that's very specific.