Ultimately, this is a pointless exercise in semantics. It doesn’t matter what you think a word should mean. What matters is that, when you use it in the wider world, it has a particular meaning for the rest of society. If you use it to mean something else, people won’t understand, and possibly think you’re not quite all there.
Most people identify a cyborg with the Terminator, or Jean-Luc Picard after his assimilation into the Borg collective. Perhaps they extend their vision of a cyborg to a non-fictional person wearing very mechanical- or electromechanical-looking protheses. But most people don’t view any human - including themselves - as cyborgs, Haraway-style, or people wearing rice-grain sized RFID transponders or magnets under their skin.
That’s why I refuse to use the word: my definition of it doesn’t match society’s. Those who want to be taken seriously shouldn’t neither in most social settings.
You’re free to try and shift the meaning of the word cyborg if you want, but it’s not going to happen overnight 