I can't help but feel this is a useful analysis for humanity, but somehow saddening for a fan of the person being analyzed. Almost overly invasive.
Would Sir Terry have appreciated or approved of this?
He seemed pretty curious about the world, and was pretty candid about his disease. Not to put words in his mouth, but I suspect he'd have been interested in this. I can imagine him have Lord Vetinari detect a decline from someone's writing and make some subtle move as a result!
Didn't the Oblivion NPC he contribute to get a bunch of features to help him deal with the problems he faced playing the game? I never met the man, but I think he'd be appreciative of the studies if they help people who suffer from dementia and/or Alzheimer’s.