There is nothing wrong with this article, but on the other hand it is far from being right. Yes, building a mobile website has the flavor of build once, distribute everywhere, but it does not always lead to the best result. Many will likely interpret this article to say that you need just 1 mobile-optimized site. Yet there are phones and tablets to consider. You can utilize responsive design, but it is not simple, nor does it solve all the world’s problems. Here’s a good article on a comparison for building mobile optimized sites.
Secondly, the article quotes IDC market share numbers between iOS and Android to make the case that WTSP and others made a mistake in targeting iOS in addition to building a dedicated app. But the writer also conveniently leaves out statistics which say that even with the difference in “activation” share, that iOS leads in mobile browsing usage by a factor of 4:1 even with the imbalance the other way in activation share. Further the writer also leaves out the fact that user engagement is typically much higher in a dedicated native app than in a mobile site, in part because of finer control of the environment and the ability to leverage the native capabilities of the devices themselves in the interaction.
But despite the inaccuracies in the article, there are companies who would be better served with a mobile website than incurring the expense of a native app (whether iOS or Android). But it’s decision that must be made thoughtfully, without bias and based on the objectives you want to achieve. This is not a religious battle, nor is it one where you should look only for the lowest cost solution.