Is that chick in the photo not exhibiting an over-arched lower back? Seems like that would be putting the pinch on the spinal discs.
Also, should you really be looking up like that during a low bar squat? Seems like she is looking up instead of just forward.
I try and keep a straighter back than that. Not an erect torso, mind you, but a straight back.
Regarding the article: yeah we get it, we all love the gym and working out, that why we check anabolicminds.com