Believe what you want. Your sig kinda says it all. A book about a test protocol to simulate what a bullet will do based on a mathematical formula in a water to equate to media that is used to simulate human tissue with no regard for any other physiological reason people stop fighting. Because that cannot be quantified in a lab.
The most reliable indicator is actual police shootings, but most departments are somewhat tight lipped about this data unless you have an inside source. Which is why I go back to high energy rounds being the most reliable fight stoppers.
My rifle and pistol are tools, I am the weapon.