$form vs $form_state

On line 304 of agreement.module the agreement form is declared,

function agreement_form($form, $text, $status = 0, $uid = -1) {

But the FAPI docs say that the first argument in a form function should be $form_state, so line 304 should be,

function agreement_form($form_state, $text, $status = 0, $uid = -1) {

It caused some problems for me when using drupal_execute and luckily a coworker noticed the difference.