Yes this is correct, we are taught to shoot center mass due to our percentage of hits goes way down in a critical situation. We also teach our officers to shoot until the threat is no longer a threat. Not necessarily to kill someone although that's the result in officer involved shootings from time to time.
As far as her mistaking her firearm for a TASER it's unacceptable and I agree it never should've happened, but this HAS happened in law enforcement before across the country and there IS a "reasoning" behind it, it seems, and it has to do with how the officer was dealing with stress, how she was processing that stress, and how she had her TASER located on her belt, and which hand she would normally be drawing with. That's simplifying it quite a bit and I don't really want to be part of the discussion because I usually end up getting bagged on pretty hard in these threads so I'd rather avoid that. But it's a big enough of a liability that I've been training our officers for YEARS on ways to avoid it so they are well versed on how to avoid this very situation.