Shark scavenging helps reveal clues about human remains. Shark feeding habits are helping scientists identify marks on human bones found in the ocean. By analyzing shark scavenging behavior, researchers identified which marks were left behind by sharks, what species of sharks made the marks and where the feedings might have occurred. Source 9f.
Yes, he was lucky in an incredibly unlucky way. I mean, he was lucky to survive that attack, which sounds like the videos I've seen of great whites rising up out of the ocean to catch a seal in its jaws. But he was oh so unlucky to be the one the great white chose for it.
While shark attacks are real and scary I do not understand why some people will go and try to make false shark sightings. This makes no sense to me.