Maybe I have misunderstood the term, “printmap.”
As I understood at the conference, and my 72 year old brain is trying to remember, Alan Ross had constructed an overlay for each of the twenty pictures that let more or less light go through in various areas, that would then achieve the AA look. How much of an over all burn he did before this and how much dancing around with dodging tools he did beyond this I don’t remember. The impression I got was there was little of the latter.
He then said that with Photoshop this was no longer necessary. At that point I phased out thinking of the famous AA quote that the negative was the score and the print was the performance. It all felt like a cheap record after the revelation of the process.