So show actual decline the article would have to use some metric based on absolute bitorrent bandwidth. Instead it uses percentages of total traffic. So it could just be showing that Nefix has gotten popular, not anything about bitorrent.
yeah I take issue with the way the stats are presented in this article, and I hoped that more people would be saying it in the comments. a smaller share doesn't directly mean smaller usage, it might as well mean bigger usage of services (which we know increased) while p2p remained constant. the fact that it hasn't grown with the rest of the internet doesn't mean that it isn't as big as it used to be