WordPress allows the creation of custom post types, much as Drupal lets you create custom content types (node types). Vanilla installations have no UI for this, there's just an API, which is probably why I haven't seen such an export until now - you need to install a plugin to be able to create new post types in the UI.
Anyway, it would be nice to support custom post types. It also would require some major refactoring, since our knowledge of the three key built-in types - post, page, and attachment - is hard-wired.
Postponed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
After 11 years calling it postponed. If anyone gets a patch going in the current branch compatible with Drupal 10 open it up again!
Closing this as we move on from 7.x. Feel free to open again if anyone works on it.