Whether or not he had the subjective experience, if he truly has no free will he has no ability to evaluate the evidence any other way than he did, no matter how good the evidence actually is. So if his conclusion is correct, we cannot trust his conclusion.
Whether or not he had the subjective experience, if he truly has no free will he has no ability to evaluate the evidence any other way than he did, no matter how good the evidence actually is. So if his conclusion is correct, we cannot trust his conclusion.
Or anyone else's. About anything.
Including our own.
If he's right, then science and reason are dead.