The point of this article isn't about open source-- it's about open standards. In fact, it doesn't mention open source or free software at all. He actually says

The point of this article isn't about open source-- it's about open standards. In fact, it doesn't mention open source or free software at all. He actually says "The bigger problem is that they’ve abandoned interoperability." Chrome, Safari, Firefox, even IE are all interoperable; by working together on open standards, users have a nice selection of choices, regardless of opinions on FOSS/Closed-source.