jQuery version not printing on status page

I've noticed this in passing before but have come back to it because I was looking to include the same thing in my module.

In jquery_update.install hook_requirements:

<?php
      elseif ($phase == 'runtime') {
        $requirements['jquery'] = array(
          'title' => $t('jQuery Update'),
          'description' => $t('The current installed version of jQuery is !version', array('%core' => 'misc/jquery.js', '%mod' => $path, '!version' => '<strong><script>document.write($().jquery);</script><noscript>javascript not enabled</noscript></strong>')),
          'severity' => REQUIREMENT_OK,
          'value' => $t('Installed correctly'),
        );
      }
?>

The !version is not getting written to the page. On the status page it just says:

The current installed version of jQuery is

Any ideas why this might be?