FWIW, he isn't new to performance driving: "A lifelong auto enthusiast, Reuss is a certified industry pool test driver on the North Course of the Nürburgring Motorsport Racetrack in Germany, and is licensed for FIA C and IMSA Road Racing. His first car was a 1967 Chevrolet Camaro, which he bought and restored himself."
He's also been the head of their performance division in the past, so I'm sure he is aware of their traction/stability control systems.
I think the real lesson is that these things happen to the best of us. I think a lot of drivers, myself included, get to a point where they feel extremely comfortable on track, that nothing bad is going to happen, etc. Then it does.