From the article:
More competition would be great for the iOS browser space, but the reality is that competition will mostly be from the other big "gatekeeper" in the room: Google. Chrome is the project with the resources and reach to better compete with Safari, and working its way into iOS will bring the web close to a Chrome monoculture. Google's browser may have better support for certain web features, but it will also come with a built-in tracking system that spies on users and serves up their interests to advertisers. Safari has a much better privacy story.
It's borderline journalistic malpractice to conspicuously ignore the fact that Firefox is way better for privacy than either of them.