I think that the shot in question, should not be DQ in either comp. He posted his entry for the Artistic Comp. Jan 21 2008, 12:05 PM, and his entry in this Comp. was Jan 25 2008, 11:37 AM.
This competition did not mention anything about entering a previous Competition Entry.
He entered the Artistic Comp, with a shot that had not been previously used in a competition, at that time anyway. He entered this competition four days later. So he didn't break any rules, in either competition. Anyway, his shot is nothing special, when compared to the quality of the entries in the Artistic Comp.
I understand the point-of-view for DQing the entry, but there should not be any 'un-written' rules in these comps.