OK, I finally took a look at it (I was at work previously).
Looks to me like he might be goofing off a bit on the slow sweepers (drifting them), but it seems like the high speed stuff is just the way it drives. It reminds me of an extreme AutoX setup running a road coarse. Notice that almost any steering input requires an immediate and rather violent counter steer to keep the big tires at the rear.
I still say it would be ball-o-fun to do (after the 20 or so spin-outs learning the handling). Although I suspect if I was driving that car there would be a few motorcyclists in the hospital!