I don't think they're asserting that anyone/everyone who doesn't want to have children has a mental health problem, but as the article conveys, widespread traum

I don't think they're asserting that anyone/everyone who doesn't want to have children has a mental health problem, but as the article conveys, widespread trauma and despair seems to be a significant factor behind this macro-trend. Maybe it's rational reaction rather than a mental illness. I'm not arguing the toss on that.