Author or Acting User read Anonymous

This probably has to do with this part of entity_delete_log.module:

// If there is an entity user id, we'll use that as the author, otherwise
    // we'll just use user #1. We don't want to use the deleted user's entity id
    // as the author, since they will lo longer exist, so we'll just use #1.
    $variables['author'] = 1;
    if (isset($entity->uid) && $type != 'user') {
      $user = $entity->uid->entity;
      if ($user instanceof User) {
        $variables['author'] = $entity->uid->entity->id();
      }
    }

$entity->uid is a protected property if it exists at all. Therefore the if statement fails and the author is never assigned.