I was curious too and checked the article but skimming it, instead of a total, I found this:
A new analysis from MUSO, a U.K.-based anti-piracy analyst [...]
With the study being done by a clearly biased person/group and that large omission, I think it's fair to assume that the % of total web traffic going to pirates might not have gone up all that much, maybe it even went down.
Wait, that's what I meant by "clipped".
Now I'm curious in what other way my comment could be taken.