I'm pretty sure you can go back a lot further if you keep redefining the meaning of the word. Would some Roman general sending a spy into an opposing camp to steal codes be a cyber attack?
The semaphore ploy strikes me as much more rooted in information, thus the description “cyber”. Stealing code is just theft, since the object of theft doesn't generally qualify the act (though it does in some cases).
Not too sure about the -tikos thing and the "good at" part, google (and the Oxford dictionary) gives etymology from kubernetes, pilot. Cybernetics is then, I guess, the science of (automatic) control, so nothing to do with "steering".
