We don’t really know that from the article. What commands were given? What commands were complied with. What was the attitude/resistance of the perp?
If you’re told to keep your hands on the wheel/in the air, and you reach to the vicinity of a visible firearm, you’re going to be justifiably shot. No cop should have to wait for the perp to execute him.
No citizen should be murdered just because a civil servant is easily frightened. “Officer Safety” is not the root password to the Constitution.
Again, We the People are armed. Our servants need to accustom themselves to that fact, and learn to mind their manners.