The campground is on NC 80 and if you come to it from the south from Marion the road isn't bad at all. I think the 5 miles they are referring to is if you come to it off of the Blue Ridge Parkway which would be approaching the campground from the north.
From that direction, the road is steep with lots of switchbacks.
'11 GMC Acadia SLT AWD
'11 GMC Sierra 1500 4x4 Extended Cab