A couple things jump out at me. First off, the Chad guys know without a doubt they are good looking, and they know they're getting by on their looks. It's not that they're conceited, it's because the feedback they have received confirms it for them.
Secondly, that guy's pickup lines are pretty much what they tell you not to do (call the girl beautiful). He just says "Why so pretty?", or "Where'd you get that? That beauty?", or the obviously canned "Hey, you dropped something - my jaw, because you're so beautiful", and it's ON. But PUA gurus tell you not to mention a woman's beauty, but to focus on some tiny detail if you want to give a compliment, like her earrings or something.