I don't think the author makes a claim that he is a psychologist, he refers himself as pop psychologist,probably jokingly From the article: The term arreste

I don't think the author makes a claim that he is a psychologist, he refers himself as pop psychologist,probably jokingly From the article: The term arrested development is now deprecated by professional psychologists and has been replaced by developmentally disabled.This is good news for <b>us pop psychologists</b> hawking crude over-simplifications about functional adults, since we can safely steal the term.