What's wrong with the way he's squatting, as pictured in this thread? Or are you making this statement based on other evidence?
I have never seen a photo of Arnie squatting where his form was decent. Either his knees are caving, his push is through his toes/front of his foot, his knees are
way too far out in front, his back is fucked, his depth is shite, etc. ... It's painful to look at.
Like I say, he developed wheels to an acceptable degree (for the time) because he did squats and leg work, had good genetics and swallowed handfuls of pills like they were going out of style, but his squatting prowess was nowhere to be found.