> If machines that bullshit are philosophically indistinguishable from intelligent humans, how is it that humans that bullshit are distinguishable from intelligent humans?

Well, if we use the ReAct model, the flow of action involves the LLM narrating its reasoning and then acting on it. Which can still be bullshit, of course, but its at least a different thing than a post hoc rationalization when questioned. (Of course, we know that when questioned about past actions, humans often construct post hoc rationalizations, too.)