Logs of people dying in raids don't give adequate data to suggest a class' survivabilty, I'm sorry, that's just absurd. Someone can die for literally any reason and it doesn't take into consideration fault of the player, what personals they had available and didn't use, if the raid leader called a wipe (since it includes "progression wipes"), etc.
You only need look at the top M+ groups to know that Resto Druid survivability is indeed a niche as they are able to consistently live through higher keys than other healing classes. Of course Paladin is lumped in here too, but it's not really worth a debate on whose survivability package is better since they are both situationally powerful defensively.