Ryan probably gave you the right answer. I have never gotten the distinction between road and LDR track straight in my mind. It seems curious that if you can set a 100 mile record on a track, why not a one mile? Is a puzzlement.
I downloaded the course map and saw no reference to an offset for the one mile distance. I'll check the course list, Maybe it's certified as a mile as well as a track.
Just looked. It is. TN01030RH is certified at the one mile distance, and the map shows it.