The video has a good point. The hips hold up the rest of the body and arteries run through it.
Right. Pelvis shots slow down the threat. If you have a threat coming at you and the torso shots have not stopped it, the pelvis shot will slow the advance buying time.The caveat on the pelvis shot is that while it is effective in putting the opponent on the ground, it does not immediately take him out of the fight. It buys you time to end fight
My training was two in chest, but if opponent was upright then two in pelvis, then one in head. If opponent was obviously in body armor, skip the chest shots. But the pelvis shot does not stop opponent from using arms and chest to accurately shoot at you, you have not broken down his upper body.