why 404 error not work when we get profile is default page?

hello,
i get profile is default page for this link address url/permalink
and i change in components/com_easysocial/views/profile/view.html.php
in line 53
// When the user tries to view his own profile but if he isn't logged in, throw a login page.
if ($id == 0) {
//return FD::requireLogin();
$url = JRoute::_('index.php?option=com_content&view=featured&Itemid=101');
return $this->redirect($url);
}

now when I type wrong address like http://www.mydomain/aaaaaa
this redirect to this address
index.php?option=com_content&view=featured&Itemid=101