Hafthór Björnsson and the 640kg log legend!

A thousand years after the stories of Orm Storolfson who carried the mast of the viking ship Ormen Lange on his own shoulders for three steps, Hafthór Björnsson ( The "Mountain", from the Game of Thrones Series) was the first to carry the 640 kg log for a mere five steps - as the first to do so since the viking days and it's of course a new world record. Is this guy human?