Or else he's just a busy guy with a lot on his plate apart from this one project which he's not that interested in with some guy who keeps pestering him.
Also, if the manager was considering hiring this guy, he was probably looking not just at his code, but evaluating what kind of a person he is and culture fit. If they're hustling to get ready for WWDC while this guy keeps emailing and pointing out what competitors like Google are doing (as if they don't know this), he may have concluded that this is someone he just doesn't want to work with, regardless of the guy's algorithm.
If this was just trying to harden him up for what it's really like to work inside of Apple, it's a wonder they get anything done at all.