MD is a technology guy who strives for the ultimate in image quality and can afford to shoot with whatever he wants. There's nothing new about that and he has written a number of articles on LuLa before starting up his own tome along with Jim Taskett of Bear Images. He may prattle on about 'fine art' photography somewhat but you can't fault him for wanting to use the best possible tools he can to remove any technical limitation in his pursuit for perfection. For him, that's obviously very important.
I thought that the review was well written and for the most part objective. It wasn't a comparative review and reflected his personal bias towards Phase One and Alpa / Rodenstock (which coincidentally Jim Taskett sells), but then again there are many of us that have a similar bias (yup, guilty as charged).
Now whether you NEED this level of gear to produce 'fine art' is a completely different discussion, as is what exactly is 'fine art'? In my experience truly talented artists can and do produce great work with just about anything from a pinhole camera, cellphone, leaky film cameras with pebble lenses, point & shoots, and perhaps if they have the means, $100k 100mp XF outfits ...