Yeah nah, that’s not what he says at all. In that video, he says: “there is no accepted definition of a fourth person pronoun, here are some concepts that are sometimes referred to as the fourth person, does the modern usage of “chat” fit any of these?” and the answer is: “in some specific ways yes, in other ways no.”
I don’t think he’s the one that started the idea of chat being a fourth person pronoun, I think he’s just discussing the statement and using it as an opportunity to communicate some linguistic concepts, which is cool and good. Also, what’s in your craw, different person?
(This comment is not really a criticism)
you would not be the first person to look at the etymology of a slur, note that it originally had a different context, and point out that it doesn’t really map 1:1 with its usage.
having not watched the clone wars I can’t comment on specifics with your example.
Anyway, regarding slurs against non-sentient things: “Lemon”, “hunkajunk”, “shitbox” get used for cars, i demand justice for cars!!!