Is shooting someone for that proportional? No, I don't think so.
Do I have sympathy for this prankster getting shot? Nope. I hope it serves as a deterrent to anyone else doing these kind of videos. Using a stranger as the butt of your jokes for clout or money is a disgrace.
Same goes for earlier this week for that Johnny Somali (not his real name, some American) who was arrested in Japan after months of harassing locals, anything from going up to them shouting "Hiroshima, Nagasaki" randomly. Even after getting choked by Yakuza and got knocked out cold by some other caucasian dude he still continued to do it right up until this week when he was arrested for trespassing of all things....as he filmed it.
3 years maximum sentence, deportation coming up as they have the evidence (from him) and Japan has a 99.8% conviction rate.