I don't want to get bogged down in a contract analysis. Regardless of how the incidental benefits are subject to change (a condition generally understood and explicitly defined in the contract), the actual terms (terms as in language and definitions, not terms as in conditions of the contract) (or any contract for that matter) are not subject to "intechangeability". We're not talking about the benefits or rules changing, we are talking about the legal specificity of the language incorporated into the contract, specifically those terms defining any party to the contract.
The emphasis (bold) was added by the poster, but the word is capitalized in the original text. It is the capitalization which is of importance. As I said above, a capitalized term is a defined term, and cannot be used interchangeably other than with its definition. In other words, you may use the term "Company" (capitalized) in a contract, ONLY if you have previously defined the term as meaning "The Walt Disney Company", and only those two terms may be used interchangeably. You cannot later decide that the capitalized term "Company" can also represent the title company, or a real estate broker, for example.
Anyway, Disney is notorious for lazily written contracts, and for simply ignoring them altogether if they are poorly written or end up not being interpreted in their own best interest. They simply rely on the likelihood that no one wants to challenge them on it. We'll see how the whole 2042/2057 Quitclaim Deed/Extension fiasco plays out at OKW, for example.
ETA: When I say lazy contracts, I'm referring to the boilerplate agreements like those used for DVC sales., where hundreds of thousands exist, and hundreds or thousands are added every week, not the contract signed when they bought Fox. Large national homebuilders do the same thing: they add to, amend, revise, recycle, and generally overedit contracts to the point where you can find any number of errors and contradictions in them. It's easier and cheaper than writing new ones. Unfortunately, it's also like buying a pair of pants when you are 6 years old, and trying to alter them so they still fit you your entire life.