It's hard to believe that whoever wrote that headline actually has experience with severe depression. I have lived together with two people suffering from this, and they can absolutely not think better because of their illness. Maybe people think that "depression" means being sad, but it's much more a feeling of anxiety and desperation. Depressed people usually don't see a way out of it and will not think rationally about their problems.

Also, please don't spread misinformation like "depression resolves spontaneously". It is true that it gets better and worse over time, but not treating a depression is extremely dangerous, as patients tend to see suicide as a good solution to everyone problems. The idea there is that they make live troublesome for everyone, and as they themselves stop caring for their own live at some point, suicide looks like way out.