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Not true, they scan the binary for symbols. I.e. they check for any usage of private api's. I doubt that they will reject an app just because of their usage of NS.. classes, but on the other hand if the NS... class accidentally has the same name of another internal private Apple API, the app will be rejected (Has happened to other developers already).

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You should be stripping your binary of symbols. (-strip-all, -s)

I used the word "inspect" carefully. Apple is probably looking for calls to private APIs by looking at the addresses of functions called in your binary with the addresses of private APIs.

They are probably looking for method swizzling of Cocoa APIs by looking at the address passed into method_exchangeImplementations, class_replaceMethod, etc.

Looking at the symbols within a binary is probably more effort than it is worth and probably isn't going to be very effective.

The names of all of your classes and messages can be found with `strings` anyways, if they did want to reject based on those.

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