As someone who is suffering from depression and tried therapy, I think this is too vast a topic to sum it up in one poignant description like that and there are

As someone who is suffering from depression and tried therapy, I think this is too vast a topic to sum it up in one poignant description like that and there are definitely different "complicated minds" and each one of them can experience it differently. So, it is as valid a description as any other because it can have just as many different root causes. The same is true for the "complicated" part - ultimately, both are rather superficial summaries probably for the sake of brevity, so while not appreciative of the actual issues, both do fit in the article since the intentions weren't to really analyze anyone's state of mind.