This stuff is purely circus shit.
Without the support wear, that 1300 pounds, the SECOND he unlocked his elbows, would have quite literally caved his ribcage and severed his spine.
And, anyway, without the balancing aid once unracked, the bar would have dropped in an arc, either crushing his pelvis into dust or collapsing the equipment before pancaking his face. And possibly injuring the spotters and cratering the platform and floor.