A diagnostic criterion can tell you what depression is. It can't tell you what depression feels like at sixteen, in your bedroom at three in the morning, with a math test the next day.
The Voices cluster is where the rest of the publication finds its center. It's where teens describe what helped and what didn't. Where parents tell the story they wish someone had told them. Where clinicians who've been in the field for decades tell us what they've learned. Where researchers translate findings the rest of us would never see.
Voices pieces are not clinical reference material. They are read because they are true, and because they're written by people who have lived what they're describing.