Setting aside the debate over semantics (and I'm not sure why a niche definition of "authentic" would be used so far outside of it's academic arena), I don't agree that an attraction's original name and theming is desirable simply because it started that way. Not all change is good, but that does not mean that all change is bad. Parks, like many things, evolve. Guest preferences, societal norms, technical capabilities, and many other factors change. It is both bad for business and bad for guest experience to refuse to adapt, in my opinion. I would argue that a park that does not refresh its lineup will viewed more harshly than one that changes ride names as it switches IPs.