Exactly what I was about to say. That record's been out for less than two months. 550k already is nuts. Foo Fighters only beat them by 100k with their album being on store shelves seven months longer.
I don't know what everyone's complaining about, really. This is a pretty good sampling of modern rock in all its various flavors. Yeah, some of it is mainstream tripe, but a significant amount of it isn't. As for the overall numbers, keep in mind that at retail prices, even the lowest album on that chart easily clears a million bucks in gross. The heyday of physical media may be gone, but album sales are still nothing to sniff at.