"Troll" still means someone whose goal is to make someone look bad.

In this case, the guy asked a question that he already knew the answer to in an attempt to make Jobs look bad by being the messenger.

Jobs evaded the question, instead of answering it, which was the only way to save face. With trolls, this is almost always the case, because they set up their question in such a way that there's no good answer to it.