In retrospect I think you could be right on both counts. First, I should have called the guy an astroturfer instead of a troll to use more correct terminology. Second, yes, the guy may not be a Samsung forum shill after all, but I'm basing this possibility solely on the fact that he took the time to add some profile information about [himself | some real person]. The reason why I didn't believe this account is real still exists though: it was created and used solely for the purpose of commenting on the Samsung thread.

While this may or may not be a coincidence, my reaction is so negative by default because recently there have been a lot of single-purpose accounts that seem to exist only for one thread before they're being abandoned. They are usually employed to troll, to attack someone personally, to post or promote blog spam, or to shill for something. In fact, it has gotten so bad I can usually tell by the post's content and style whether this person is engaging in a quick hit-and-run or if they intent to stay around. I believe we're still putting too much weight on "green" accounts. Maybe their posts should be gray by default.

I might have come up with a false positive in this case, but there is no evidence to support that yet.