I loved that video of the S4 taking down the Supra. never underestimate the fact that S4 are AWD and 2.7L bi-turbo. Yes, Supras are hella cool but don't shoot a car down for having four doors.
I have a lot of respect for drifting and admire the drives who can do it safely. With that said, I do not think he was out of line drifting that track. However, I do think it is out of line to drift an SCCA course. What differentiates the two? I have no idea. That is just my personal opinion.