The article is, to use the one overly cleaver 19th century word not used by the author, poppycock.
Poppycock? Not so fast...
“...we dont want to find ourselves 200 years from now still defending the obviousness of natural selection from those poor souls who would rather not grasp it...”
Welllll, here is a superview of the view from Bohuntine Hill ( bottom right ) eastward, showing the "roads" across the valley and the presumed col leading to the east.
Following it in Google Earth, it seems to lead up into the highlands, so would not be a drainage route.
Is this the basis of your asservation?