I’m wondering if severity of first touchdown, which I’m not sure is what is in video(s), may have been compounded by the effect of direct law and closing thrust levers of low slung engines prior to touchdown resulting in a pitch down (if that’s what they had).
I’ve flown 737-300 and A320. The effect on pitch of changing thrust on the former was instinctive as it was always effectively in Direct Law.
The Sioux City UA DC-10 reports cited the effect of reducing thrust prior to touchdown as contributory to the hard landing (notwithstanding the brilliant job they did with the cards they were dealt).