If anything, I got the impression that the Apple Manager was stalling (or maybe he really was ill and it really took him 10 days - from May 4 to May 14 - to "get back on his feet")
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.
Especially considering the timeframe - right around WWDC. This eng manager was likely scrambling like crazy to get ready for that.
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.
So they are evaluating how well the guy responds to missed deadlines? It seems he was promised responses on specific timelines that kept falling through with no response and with the weakest of lip-service paid when he prodded them enough to get an answer.
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.
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.