EA simply bought Chillingo, the publisher of Angry Birds (and Cut the Rope, and several other top iOS games) a few weeks ago. I don't know what deals Rovio, Zetptolabs, etc. have with Chillingo, but no, EA does not own Angry Birds as far as I can tell.
That explains it. I was looking at the chart in the article and thought he had missed Angry Birds Seasons. Just makes the EA logo next to Angry Birds seem out of place.