Just to be clear, the phrase "productivity pr0n" is used in the headline not because it's a direct quotation, but because it succintly describes a lot of what Mann is eliminating.
Also, once his "productivity" blog became so popular, others who smelled easy money started their own blogs that seem to capitalize on keeping people caught up in maya* to draw traffic rather than actually helping them solve their own problems, productivity or otherwise.
* See: http://en.wikipedia.org/wiki/Maya_%28illusion%29#Concepts_an...