While I agree with you that there are various levels of help people who suffer from mental illnesses need to get better, I don’t think it really helps to belittle anyone else’s story of what helped them.
Nothing in this life is a ‘one size fits all’ type of solution. That being said, telling someone who’s sharing their story that they’re trivializing the very thing they’re going through, is the opposite of helpful, to anyone. Some people need meds, some need a creative outlet, some need therapy, some need hospitalization — so to tell any one person using any of those that their viewpoint is wrong/trivializing/belittling/etc is harmful to say the least, no matter how well-intentioned you are.
Coping/recovering/dealing with mental health is a very personal thing that no one should ever judge, the same with how people grieve. All the author was doing was sharing his story in hopes it will help someone else, never stating it was the only way to help everyone.
It’s important to remember every mental health disorder is a sliding scale; what works for some is overkill for others and vice versa. Attacking someone trying to help by sharing their story is only perpetuating the stigma in our society so many of us are actively trying to end.