The guy threatened to kill a politician and blow up a mosque. I'm not sure "internet troll" is a sane description. It's not like he was posting about emacs on a vim mailing list. He committed real crimes that are illegal whether the internet is involved or not.
The term "internet troll" could be used as defusing terminology by the defense to imply that the comments were solely made to elicit response, rather than threaten or harm. The Guardian would then use the term in the title to show how even a self-described internet troll isn't safe from repercussions, regardless of stated intention.
