Well. The user's reaction when the news finally went mainstream - "Is this enough proof you fucking retards? I was right" - suggests to me he was just someone who got frustrated that his (correct) edits were being removed.
http://en.wikipedia.org/w/index.php?title=David_S._Rohde&...
If his intention was to help the man's captors spread the word, that edit wouldn't serve any purpose since he had already escaped. Though I suppose you could argue he wanted to stay "in character" for his own protection...
It does raise an interesting point, especially given the timeframe in which the user kept trying to post that information, given it was occurring over a period of several months.
I'm purely speculating here, but I would suspect that said "anonymous" user in Florida might be getting a knock on his door from the DHS soon.