You and the original article seem to be making two arguments that sound good in isolation but are incompatible. You are saying that it's no good to advice peop

You and the original article seem to be making two arguments that sound good in isolation but are incompatible. You are saying that it's no good to advice people with severe mental health issues to do better if they are poor (fair), whereas the article says early poverty increases the chances of having these disorders (also fair). The causation in two arguments is reversed, however (poor -> mental disorder, mental disorder -> poor), and this is where the OP's argument fits, I think... you become more likely to develop mental disorders because of certain aspects of poverty (malnutrition? bad habits/lifestyle? etc.), however for someone who believes in personal responsibility, that may be to a significant degree because you "didn't do better".