You are correct, wall squats are not in line with Positive Parenting. They are a disciplinary tactic used to control behavior be placing the child in a physically uncomfortable position, in an effort to teach a lesson, but what will a child gain by squatting along a wall?
Will he learn why he actions were wrong?
Will he learn what to do in the future?
How will wall squats improve the child and lead to positive self discipline?
It is impossible to provide an alternative disciplinary measure as the picture does not provide context or background information, but the method of discipline used should incorporate respect, empathy and healthy attachment to ensure that the behavior is addressed in a developmentally appropriate manner and is perceived as fair by both the parent and the child.