They’re right, but only in a very theoretical sense. As in, it’s true that you can legally shoot at officers who don’t identify themselves in self-defense, but whether that’s actually how things work in court is an entirely other matter.

https://www.npr.org/2023/05/10/1175268778/minneapolis-police-officer-felony-assault-black-man-george-floyd

https://www.cnn.com/2021/03/08/us/kenneth-walker-breonna-taylor-dismissed-charges/index.html