I think the key point is "what's the point?". Yes, we all know that surveys can be manipulated, usually to influence public opinion. But that's not the case here, because they don't release these results to the public. So what is the point? Why spend the money conducting these surveys if the outcome is predetermined? It makes no sense.
I do think Disney cares about guest opinions and guest experience, but it's one of many things that say index again, and it's not necessarily the most important one. To say that the surveys are rigged to a pre-determined outcome is a conspiracy theory that doesn't add up - because again, it costs them money to do, and they don't release the results so there's no need to manipulate them
Now, it's certainly possible that they're biases inadvertently creep into the surveys. That would make more sense to me than some calculated decision to spend gobs of money on surveys with a predetermined outcome. But to say that Disney doesn't care at all about guest experience or does these surveys to get a predetermined answer makes absolutely zero sense and smacks of ridiculous conspiracy theory.
I don't buy the everyone at Disney is some evil Ebenezer Scrooge type sitting in their counting house trying to figure out how to swindle from the poor. I think most people they are trying to do the best job they can balancing their business to the guests but also what they perceive as their duty to shareholders. That's often a difficult balance to strike, And oftentimes it ends up tilting in the wrong direction, but I don't see any evidence that they don't care about guest experience at all, or that these surveys are just for show. It just doesn't add up.