Not terrorism. The attack was somewhat narrowly targeted (at least as narrowly as technically possible, given it's all on one domain) and also tried to achieve the desired end goal. They weren't blowing up random parts of github infrastructure.
I have no question there's a political aspect, though calling the Sony attack terrorism is a better fit. Assuming the purported objective was to prevent release of The Interview, how does exposing the alias Tom Hanks uses to check in to hotels accomplish that? How does that accomplish any objective? (Regardless of the responsible party.)
