I wondered the same thing, but those posts seemed to make more sense (and were genuine questions) than the one about the seat and the Yamaha whatever it was. So, I figured they must be real.
Hadn't thought of the timestamps. I was going by content. The troll posts sounded like our "Troll" was between 9 and 13. The others sounded more like someone used to talking on instant messenger services or chat rooms and not taking time to "polish" their posts.