I was just thinking the same thing after seeing the clip. Which led me to another thought: I think that might be the shows amp. I want to say I've seen a few other artists using Sunn set ups on there before, specifically a 1200s/1000s amp (which that is. ON close inspection, it has the shorter name area, 7 knobs I believe, and no bass boost that I can see). I also remember seeing Norah Jone's bassist on one of those shows (Jay, Jimmy, Conan?), using a 1200s/1000s, though into a 2000s cab. Either way, both had guitar Sunn amps, both being produced in Burbank, CA? Methinks they might belong to a rental company in the area......
Still, LOVE seeing Sunn out there getting played.