He wasn't just a graduate of a hacker bootcamp, he was hired on by App Academy after he finished and was quickly promoted up to Director of Product. He spent a lot of time teaching people how to pass whiteboard interviews. He was probably better prepared for an interview than your average Stanford CS grad, and already had prior experience as Director of Product and a portfolio of side projects.
He didn't bluff any company. He went through Triple Byte, the trendiest new tech recruitment startup. He got an offer from Triple Byte themselves even though he didn't even apply for them, got an offer from Google, and when word about the Google offer got out every other company started bidding for him.
He's also just a really smart guy in general. If you spend 15 minutes talking to him, he'll leave an impression. It's not a bluff or a con, he's just a really smart, really analytical guy.