One cannot report on events objectively, at least not on events that are themselves highly subjective. If all he is to do is dispassionately parrot the comments of others, with no interpretation or comment, then he has no reason to write an article at all -- we could simply read the source material for ourselves.
Yes, he primarily used e-mail traffic and public statements as his source material. However, they were still primary sources, and probably more indicative of how the participants were feeling at the time than a post-event interview would be.
This story clearly has many more angles than the one Corbet chose to focus on, but for the sake of readability, he can only focus on one at a time. I think the CentOS experience would make great source material for a more in-depth article on how volunteer distributions respond to change. One could look at several different distributions that have faced similar challenges over the years -- Gentoo, Mandrake/Mandriva, etc.