TEPaul,
Behr may have held a "purist" view of architecture in the context of natural versus unnatural appearance.
I tend to think he was looking at it in the context of continuity and harmony, versus a disjointed or disconnected presentation.
Certainly, if he played NGLA as many times as you state, he had to be keenly aware of its highly artificial design and construction, especially at the green and tee end.
What's the difference in an anomaly that occurs naturally in the land, versus one that man constructs in the land ?
I think that's the critical question.
I don't think there's a difference.
However, I would add the caveat that the anomaly constructed by man, should not be outside of the boundaries of an anomaly that could be constructed by nature.
And, that may have been what Behr was alluding to.