Sure, but not in this particular case. The protestor that was shot was caught on the same video chasing down a police officer and beating him before getting shot.

https://twitter.com/bbcchinese/status/1179082367337713666

This always happens. It's the most effective way to create the illusion of legitimacy for using violence to kill peaceful protest. The French police have been doing it for ages.

Yes, but in this case the kid was engaging directly in violence so unless he himself was an agent provocateur, this particular shooting can’t be blamed on undercover cops.

Not to mention that the protests were initially peaceful, then they were repeatedly attacked by gangs at the behest of the local authorities.