This functionality is supported in the https://www.drupal.org/project/search_api_exclude_entity → module. So might be worth using that over this module.
It would be great to extend the exclude feature to cover not only Content types, but also Media types like (Documents, images, audio files ..etc.).
Active
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
This functionality is supported in the https://www.drupal.org/project/search_api_exclude_entity → module. So might be worth using that over this module.