Apps don't execute code. Since these idiots don't undertstand this, dismiss it as the nonsense it is.
FYI iOS apps are compiled to binary code, which is why you can't use any dynamic runtime code generation on them, and so *could* be vulnerable to this type of attack. i.e.: from C#-based Xamarin apps you can use Reflection.Emit to generate code at runtime on Android, OSX and Windows (which leverages the JIT features of