It's actually none too complicated - nothing The Hershey Company really does directly impacts the park. If The Hershey Company announces layoffs, that only has public relations impact on the park because people don't know the difference between The Hershey Company and Hershey Entertainment & Resorts Company.
Hershey Entertainment & Resorts Company was created in 1927 by Milton S. Hershey so non-candy producing businesses could be in their own company. This was to protect entities such as the park, the Cocoa Inn (the first hotel in Hershey - The Hotel Hershey wasn't built until the early 30s), the electric company, the water company, etc.. Prior to that point, Hershey Chocolate Company was the owner of Hersheypark. When the chocolate company experienced significant financial difficulties in 1920, a bank took control of the company for a time. This threatened all of the businesses ran by Hershey (for example, some rides planned to be added to the park in the early 20s were postponed) - and so after Hershey Chocolate recovered, within a few years, Hershey was reorganized such that the businesses in the town could not be threatened by a financial crisis at the chocolate company.
So as I said, whenever The Hershey Company does something, it's really not impacting the park beyond PR. I think the only impactful thing they could do is sell the company. Because if that happened - that certainly would impact the entire community in Hershey. We've seen what happens when that has been discussed - particularly in 2002.