ahhhhh ok a quattro, so you'll appreciate my amusement at the idea of a fwd 80 hillclimbing
my dad had an 80, it was like driving a steam loco even in the dry - only 50% throttle until it got moving. you'd think with all that weight slung out infront of the axle it would at least have some traction ...

Yeah, they were something.
But back for the OP, they DO have this stuff over here, and they DO run American cars in it. Hell, my father in law ran his 1989 Grand Voyager Turbo (oops, his was the Canadian one, even had a metric speedo....um, the van, not him.....ewwww....) and a Dodge Shadow.
But I wouldn't say Clarkson is wrong, I am sure the rigs in those runs you saw were not US or even original spec suspensions.