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The stance for competition shooting is entirely different than shooting for self defense. You practice shooting for self defense with your torso pointed at the enemy because that's what your body does instinctively when you're in danger. Turning your body 90 degrees when you recognize a threat is a waste of precious milliseconds needed to save your life. There's also the issue of body mechanics. Pointing at the enemy like I said allows you to engage your whole upper body to mitigate recoil in a way that blading your body simply does not. Whether or not they are leaning back may not be readily apparent in the image but you can say with certainty that they are not leaning forward, which again, is necessary to engage the core for recoil mitigation.

I'm not eager to explain my credentials because I find the appeal to authority thing really stupid. I will say though, the military is widely known to have subpar handgun training, evidenced by countless videos online and countless professional trainers complaining about the amount of unlearning necessary to teach modern handgun training to people with military experience.