Show node revision update date instead of "created'

function mytheme_preprocess_node(array &$variables) {
 $node = $variables['node'];
 $current_user = \Drupal::currentUser();
 $revision_ids = \Drupal::entityTypeManager()
   ->getStorage('node')
   ->revisionIds($node);
 if (count($revision_ids) > 1) {
   $revision_user = $node->getRevisionUser();
   $revision_user_output = '';
   if ($revision_user) {
     $username = $revision_user->getDisplayName();
     $uid = $revision_user->id();
     if ($current_user->hasPermission('access user profiles')) {
       $link = \Drupal\Core\Link::createFromRoute(
         $username,
         'entity.user.canonical',
         ['user' => $uid]
       )->toRenderable();
       $renderer = \Drupal::service('renderer');
       $revision_user_output = $renderer->renderPlain($link);
     }
     else {
       $revision_user_output = $username;
     }
   }
   $revision_date = \Drupal::service('date.formatter')->format(
     $node->getRevisionCreationTime(),
     'short'
   );
   $variables['revision_info'] = [
     'author_rendered' => $revision_user_output,
     'date' => $revision_date,
   ];
 }
 else {
   $variables['revision_info'] = NULL;
 }
}

<div class="node__meta">
 {{ author_picture }}
 <span{{ author_attributes }}>
   {{ author_name }}: {{ date }}
   {% if revision_info %}
     (changed {{ revision_info.author_rendered|raw }}: {{ revision_info.date }})
   {% endif %}
 </span>
 {{ metadata }}
</div>