thirachp posted a number of times in the new members thread to unlock their account... I took that to mean maybe they didn't see the note in the email that it could take up to an hour, or that they were simply impatient. No worries either way if that's the case. This "test" message might just be to see if their account had yet been activated.
Might also be spam getting warmed up as you mentioned LT, so would be a good idea for us to keep an eye on this account until they post a few messages and we know either way.