Actually, as no one had yet posted a comment, I tried to sum up the gist of the article in one short sentence, thinking it might provoke actual discussion. I think we're probably both pretty skeptical about the latest orthodoxy-challenging discovery.

Nonetheless, the mechanics of brain atrophy (not that I understand them, but I understand how muscles atrophy a bit from wearing a cast on my arm) do seem genuinely helpful in explaining what it feels like to be depressed. It really does feel like something is happening to your brain. And these people seem to think so. No idea if its true or not, but its helpful to have that idea out there.