Yeah both arms should both be straight and triceps locked out before you initiate the pull.
Dan green regularly pulls with his arm bent slightly, just had surgery on a bicep tear. Think it’s his second one but I could be wrong.
That’s why though, he pulls with a bent arm that isn’t locked out properly.
Liam’s commented on it several times in the past and I’ve noticed it in a few of his vids so form flaws can happen even at his level. This one is fairly common with people using mixed grip as it happens.
Dan Green coaches people to deadlift himself and still doesn’t get it right haha.
Only in a strength sport would such levels of retard be taken seriously.