After reading the article, scroll down and read the comments until you get to the one by Andy Umbo. He basically says that in his experience, that level of manipulation in those prints would be wishful thinking, and that most likely none of them received anything like what the markings indicate. Unlike him, I make no claim to being an expert printer, but just based on my admitedly limited experience with dodging and burning, it does seem to be a bit of a stretch, that so many changes would be necessary to achieve the final result, or that the result of so many changes could be so seemless. In fact to me, some of the changes seem almost random, with two identical adjacent regions being given different times, with no discernable difference apparent in the final print.
I'd be curious to hear opinions from some APUG printers.
I, too, make no claims to my printing expertise, other than to say after 40+ years, I'm pretty good. But, I think you might be on to something ...