AWD and FR has a differnt sliping angle when drifting. I guess AR Mao is trying to have some rally style donut fun in a safe and open place. He is drifting with his Torsen OEM equiped LSD. H?e don\'t really need to use his handbrake because there isn\'t much traction on ice.
Moreover, There are different ways to drift but mostly for FR car due to the nature here are some examples.
Power drift
handbrake
clutch
weight transfer
powerslide
I believe Ar mao is using Power drift in this situation, he is breaking lose his rear end by giving big gas. He is able to do it easy on the snow without big power because the traction is low on snow with his summer tires.