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I'm not a developer, but does it count when they use objc header files?

#include <objc/objc.h> #include <objc/runtime.h> #include <objc/message.h> #include <objc/NSObjCRuntime.h>

I think those are all valid C header files. They just define typedefs and macros that are about ObjC, but themselves are plain C.