@fraying @bedast Not an expert on their implementation, but from the description, they probably only have content that came from directly interacting with a wordpress.com-hosted blog, e.g. fediverse likes and replies / comments.
Since the WordPress plugin is more for broadcasting content to the fediverse and less for consuming it (i.e. can't "follow" from your WP blog), their data collection is probably limited to that at the moment.