Reading the whole piece, I found it quite enlightening, especially as someone who just bought the game and played it for the first time yesterday. It's a solid argument, and a salvo against the growing trend of shady microtransaction-driven social apps. What he ultimately disapproves of is Angry Birds' ability to successfuly exploit human weakness, and make money at the same time.
He's essentially calling it what it is--a portable gambling casino, except with smaller risks and more complex compound reward schedules that rely on subconcious human desires, as all successful games of past have.