The article says "I don't do a lot of artificial intelligence, natural-language processing or machine-learning research, but if I did, Haskell would be my first pick there too." No explanation, the article goes on to explain purity and lazy evaluation that as far as I understand don't have any connection to machine learning.
To be fair, the precedeeing sentence doesn't read like the author is about to give an argument about why Haskell is good for "artificial intelligence, natural-language processing or machine-learning research".
It just reads like he merely expands his preference of Haskell for what he does, and just mention in passing how he thinks it suit him also in those other domains.
