My only guess is he’s driving a level 3 prototype in Europe. It’s not available in the USA yet. But considering this feature (not level 3) has been available in almost every USA model Mercedes for many years now, this isn’t a fair comparison at all. I also have a hard time believing the prototype would have these limitations.

Edit: A press release says the new Mercedes system only does 40mph, so yes it’s the new level 3 system. That does suck, but clearly only designed for city driving.