Query posts by users roles

query.php

<?php

/**
 * Get all the user ID's for the specified user roles
 *
 * @param  array $role
 * @return array User ID's
 */
function get_all_user_ids_by_user_roles($role)
{
  $users = get_users(array('role__in' => $role));
  $user_ids = array();
  foreach ($users as $user) {
    $user_ids[] = $user->ID;
  }
  return $user_ids;
}

$roles = ['editor', 'administrator'];
$user_ids = get_all_user_ids_by_user_roles($roles);


$args = array(
  'author__in' => $subscriber_ids,
  'post_type' => 'post',
  'post_status' => 'publish',
  'posts_per_page' => -1,
  'orderby' => 'date',
  'order' => 'DESC'
);