This is good advice. Regrettably there are many problems here. First off men tend not to go to medical professionals even if very ill, and if they do it is usually the SO that makes sure he gets help. Why this is so I do not know but I hear it is part of human nature.
Secondly the human mind is enormously complex and not infrequently even well experienced professionals do not find what is wrong. Some times they discover that it is a case of several issues. Some times the experts disagree on the situation. One small comfort is that there is a lot of development, just a few decades ago things like ADHD or Asperger syndrome were hardly recognised nor treated.
In the end what happens is that they turn to their friends for help or contact, few of which can be expected to have professional knowledge in these fields. And there are quite a few around us with varying degrees of problems; I have heard the statistics and it is rather disturbing and occasionally even growing as new aspects of the human minds are recognized.
The only thing we realistically can do is to treat our fellow humans well. And that alone will go a long way to help.