What do you mean by that? A delusion is often a symptom of a mental health issue, something doctors treat to get rid of, so I don't understand it's use in this context.
My entire knowledge of the subject is what she said in that quote and I'm otherwise ignorant of the subject from a professional perspective so I'd just be guessing if I was going to elaborate, but I can tell you what I took from it: to me it meant that most people are a little deluded about their lives. Some productively, some not so much.
What do you mean by that? A delusion is often a symptom of a mental health issue, something doctors treat to get rid of, so I don't understand it's use in this context.