Actually, what we have here is PW reporting what Harper Collins claims to be true. If you take a look, you see that their profits were primarily fueled by major bestsellers. In other words, they picked "lucky." Another publisher's profits might go down because they threw their support behind the wrong choices.
As I've said elsewhere, PW has shown itself in its reporting on numerous occasions to be the water carrier for Big Six battles and causes. It purports to be for ALL publishers, but when has it ever had more than the most grudging credit for Amazon? How often does it do intelligent and in-depth reports on small and independent presses? Not often, I'd say. It's a New York publication that carries a New York-centric viewpoint.