Well, it's titled "Proof that Concealed Carry Holders Live in a Dream World" and I'm sure some of them do. But obviously someone wants to use this as proof not to carry.
As we've discussed so many times before, if someone is intent on shooting you, you probably will get shot. Carrying a gun gives you a slight advantage. I would still rather have that slight advantage.
It doesn't change my way of thinking. In any scenario I can imagine where having to defend myself, I know I can't get the draw on someone. I will have to rely on taking cover and having time to get to my weapon, or rely on being subtle enough to draw without being noticed.
Every single self-defense circumstance is going to be different. There's really no way to prepare effectively. I think the best advice is to know how your brain functions. I know I freeze for a split second, then drop and cover, then assess and respond. With any luck I can do this quickly enough to save my skin.
Even taking this study at its worst, there was no greater harm caused by carrying, and no greater harm caused by practicing.