I didn't know job titles were gatekeeping. Do you think that a fry cook at your restaurant is also a gamedev because they happen to feed the person making the games? It has nothing to do with gatekeeping, it has to do with "words have meanings". You don't just get to decide you're a gamedev because you want to be, that doesn't make sense.
I don't even know how to answer you because your argument is so fucking stupid. No, I don't think a fry cook is a gamedev, and I have literally never in my life heard a fry cook identify as such.
It's your argument taken to its logical conclusion. If you can't figure out the logic there then that explains why you think job titles are gatekeeing.