As Bill Clinton might say, it depends what you mean by “plot.” If you mean was he acting on orders from Osama bin Ladin, who telephoned him from a cave in Waziristan, then probably not.
But if you mean he had connections with other Muslim extremists at his Virginia mosque, and if you mean that he plotted or planned this attack carefully ahead of time, and if you mean that he cold bloodedly murdered a dozen people because he considered them to be enemies of Islam, then, yes, sorry, he is a terrorist plotter.
Frankly, stuff like this makes me wish that the next Muslim terrorist would go after the offices of the NY Times.
“Frankly, stuff like this makes me wish that the next Muslim terrorist would go after the offices of the NY Times.”
Won’t ever happen.
They know who their friends are.