You're joking right? He's been posting these things for YEARS, and this is the best he could do in terms of improvement? And it's not like we're talking about rounding your back during squatting, or tucking arms while benching. This is something that you immediately know that you're doing wrong, and should be able to correct easily. He picks the weight up and puts it on his thighs. How is this anything even close to a deadlift?
If he was serious about improving his form, it should take exactly one workout to fix this. It's not like you could do what he did and not realise that you are doing it. This is about putting ego ahead of strength and the health of your body.