I agree that they do, because the experience of consciousness, what one might call the very kernel of our being in order to separate it from any medical definition, can only be measured subjectively, excluding it empiricism by definition.
However, if you are saying that the inability to construct a model of consciousness that does not apply equally well to states and people is a failure of empiricism, I think you have started with the conclusion and are looking for justification.
However, if you are saying that the inability to construct a model of consciousness that does not apply equally well to states and people is a failure of empiricism, I think you have started with the conclusion and are looking for justification.