I did some digging and it seems like the family’s suit should actually be against the pub that was renting the in-park space from Disney. It’s just unfortunate that the prevalence of corporate propaganda in news media

He is suing both Disney and the pub. The pub obviously because they were negligent and Disney because it is in Disney World. It is up to the court to decide how much liability Disney should have vs. the pub, if any.

I doubt Disney would be able to successfully argue that just because the restaurant is leasing space in Disney World that they have zero liability but that’s up to the court.