I didn't say it was "accurate". II was merely indicating that thoughts have physical influence on the body, not that you can use them to tell what someone is thinking or whether they're telling the truth.

David Hume summed it up well : "Reason is, and ought only to be, the slave of the passions.”

Eliezer tells us that "Rationalists should WIN". But you can easily substitute 'win' for 'achieve whatever makes them happy', once again reinforcing the importance of emotions. Our passions are ultimately what drive us, rationality is just taking the best available information into account when trying to achieve them.