They are going after the restaurant. The restaurant is whom they are suing. But they know they won't get much from an allergy lawsuit settlement with an Irish Pub themed restaurant, so they included the deeper-pocket Disney in the suit (which IMO is a less than honorable act, but in a capitalist society I'm always going to give the benefit of the doubt to the person, also you never know if the legal system is going to choose you to fuck with so I dually recognize the spaghetti-at-the-wall approach to damage remuneration).

Even with that said though, since the guy who decided to risk a life-threatening condition on whether a likely not much more than minimum wage employee could or would know if a thing was allergen free decided to rely on a technicality of civil litigation to get more money, then I can't fault Disney for using a technicality to try to get out of it.

Fuck Disney in general, but kudos to Disney for taking this on the chin just to not make someone even a perceived victim of their greed. I think it's honestly respectable. They're still probably not going to be at fault were it to go to trial, but they're going to settle and give this guy the obvious payday he wanted.

Good breakdown by LE