Reason why its hard to believe competition doen't count in SD Situations
The reason it isn't hard to believe is because of all the folks who state that you never know how you will do in battle. If you can never know how you will do, then you can't know if competition (the right kind) would be beneficial or not).
Of course, lots of people who have never been in competition shoot bad guys multiple times just fine. For all we know at this point, the shooting distance was across the counter or just a few feet, something where the benefits of pistol competition likely would not have made an iota of difference.
I noticed that the article didn't say how many times the guy fired, just that the suspect was hit twice.