I don't remember where they played it but I am 100% sure that they did.
I remember Glen Tipton chugging one note over and over again, I said 'what the fuck?' and then remembered that it was Dissident Agressor as soon as the main riff kicked in
4/11 Fear FestEvil w/ High on Fire
4/17 Electric Fucking Wizard
4/28 Mastodong/Clutch/Big Biz