I think I saw a post a while back from a cruiser who said Aldora took him there w/o having dived with them before. Would suggest you contact them.
wow. i hope there is something missing from that story. i am a big fan of aldora but that does not sound good to me. possible the person has a dm cert, or dove with the aldora dm somewhere else in the past. who knows? maybe the guy just got on the wrong boat somehow.