Might be. But I don't see how that would make it wrong for Will to describe his experiences, without also making it wrong for him to say he's had them and is very convinced by them.

I mean, it could. The gods would need to think that the level of evidence present in the world without any comment from Will is too low, and the level of evidence present with a description of Will's experiences is too high. It would be quite a coincidence, wouldn't it?, for the optimum level of evidence to fit into so narrow a region?