I suspect there have been a number of people who's lives were saved thanks to drones, but as Bendix said it would be helpful if this report were the work of independent investigators. And, while finding someone stranded by a flood and having them rescued could be considered a life saved there's no way to know it they would have perished otherwise.
Still, it is useful for DJI to promote such a story if for no other reason than to counterbalance the avalanche of negative press drones get. But, if the story is found to have puffed the stats in an obvious way that could actually backfire.
Brian