Menno, I didn't mean to be so blunt (a bad habit of mine, sometimes, especially when I'm in a rush). As your last line says, I'm not interested in any kind of digital vs darkroom print debate*. However, I do find it a problem that here, on APUG, that some of the first answers to a solution is, well, it maybe its a digital print. Digital hasn't been around that long in the history of printing, and yet that's the first assumption? Kenna is a masterful printer - why couldn't he have done it in a darkroom? A little research will show that the white pole image was made in 1984. So no, not digital, and unlikely to be one, even though he has been known to revisit old negs. In fact, here's a more
recent article about his thoughts on digital. I think if he had gone digital (as a few old die-hard photographers have) someone would probably know about that here on APUG.
There isn't a lot of technical information about Kenna's printing techniques because he doesn't really share them online or go into specific details. We only know about some things because of what he's said in interviews, or possibly to people who see him at his exhibitions, plus what others have said who have printed for him. The Rolf Horne link given above is another good source. But for specific photographs? IDK.
What I've always liked about him is that he is living proof that you don't need any magic bullets to do magic in the darkroom. He mostly uses Tri-X in his Hassy or occasionally a Holga, has a lab develop the film for him, and prints on Ilford MGIV, and prints small (especially in today's world of mural-sized prints). I think his work is a great blend of technical know-how combined with vision and the openness to play and experiment in the darkroom. Almost like jazz.
*FWIW, I have no problems with hybrid (and/or purely digital) techniques at all, and can't wait for APUG and DPUG to finally get hitched. That said, I'm in awe of printers like Kenna and Moersch and Rudman and Lambrecht and Carnie and so many others - I wish I had a fraction of the knowledge and skills that they have (as photographers but especially as darkroom printers), but since I'm pretty isolated here in Japan I try my best to learn what I can.