I actually don't think it's faster or slower to develop on one platform vs. another. The speed of releases you might see from companies probably has more to do with their release cycles and resources they devote to it.

Also a lot of Android developers these days are much newer to the platform than iOS. Thus there is a certain amount of learning involved which can slow down development. As I said in the article, iterating on UI was much faster on Android than iOS which can be a big win if that's where the complexity of the app lies.