doesn't seems to work…

Hello,
this pluggin doesn’t seems to work, or maybe I made a mistake ?
I have last plugins and wordpress instal, also, I created my own roles for reading, with :

function custom_roles() {
  global $wp_roles;
  add_role(
    'role_inter',
    __('Interne'),
    array(
          'read'         => true,
          'edit_posts'   => false,
          'delete_posts' => false,
      )
  );
  add_role(
      'roles_free',
    __('Freelance'),
    array(
          'read'         => true,
          'edit_posts'   => false,
          'delete_posts' => false,
      )
  );
  add_role(
      'role_externe',
    __('Externe'),
    array(
          'read'         => true,
          'edit_posts'   => false,
          'delete_posts' => false,
      )
  );
}
add_action('after_setup_theme', 'custom_roles');

Is it a problem if the role is not from the core?
I really have to restrict categories for 2 different kind of readers, does someone can teach me?
Thank you a lot ??

https://www.ads-software.com/plugins/restrict-categories/