@pfefferle For those curious about how WordPress federates, a good example is @LaurensHof's Fediverse Report.
To see all new blog posts from the Fediverse Report blog (https://fediversereport.com/) in your fediverse account simply follow @LaurensHof. Once you do, future blog posts will show up in your feed, formatted for your ActivityPub app (eg. Mastodon), and now you can comment directly from there.
For example this blog post: https://fediversereport.com/wordpress-activitypub-plugin-updates-to-v2-0/ is "federated" as show below: