Chester tried killing himself November 2016, many months before anything OML-related was released. I think it's very far-fetched that the OML criticism had anything to do with his death, at all. But ultimately, we cannot see into a person's mind and it's useless to discuss about it. I just think it's unlikely that this played any (major) role in Chester's mental problems. I feel like they received a decent amount of criticism for every album after Meteora, but yes, maybe the most for OML.
Edit: Oops, Justin had already written the same xD