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>"It's not like game dev is one of the most complex kind of development and requires game design as well as low-level graphics programming skills."

Depending on the game that you are making the developing is not necessarily complex nor require low-level graphics programming skills, especially now that you can find high quality open sourced game engines out there.

The games he wrote were a bluetooth enabled card game and simon says. (check the link) These would use different iOS APIs but are not complex and do not require low-level graphics programming skills.

The bluetooth card game is actually a tutorial level kind of thing. Ray Wenderlich and Apple's own docs have a version of it.

I imagine this is more in reference to his experience with the languages, not programming. Taking a guess, I imagine most of his time wasn't spent writing Obj-C, but rather C. In this case, there was very little he could carry over when developing the iOS app with Cocoa.