Rationality, LW or otherwise, has nothing to say about “correctness” of terminal values.
Correctness is the property of a description that accords with the thing being described. When you ask, “What are my terminal values?”, you are seeking just such a description. A belief about terminal values can be correct or incorrect when it reflects or doesn’t reflect the terminal values themselves. This is not fundamentally different from a belief about yesterday’s weather being correct or incorrect when it reflects the weather correctly or incorrectly. Of course, the weather itself can’t be “correct” or “incorrect”.
Correctness is the property of a description that accords with the thing being described. When you ask, “What are my terminal values?”, you are seeking just such a description. A belief about terminal values can be correct or incorrect when it reflects or doesn’t reflect the terminal values themselves. This is not fundamentally different from a belief about yesterday’s weather being correct or incorrect when it reflects the weather correctly or incorrectly. Of course, the weather itself can’t be “correct” or “incorrect”.