Impressive, but not the most impressive. Chakarov(90kg) did 270x3 in another ironmind vid.
Some highly impressive squat feats:
Oleg Perepetchenov: 310kg backsquat and 285kg frontsquat @ 77kg
Taranenko: 310kgx3 frontsquat
Rezazadeh: 390kg backsquat
David Rigert: 3x305kg backsquat @ 100kg