It’s not a Discourse plugin. It’s a WordPress plugin. There are topics about it in Customization > Extras like WP Discourse 1.5 Release, but that’s not a category for support questions.
I enjoy that it has a separate support category instead of just a wp-discourse tag within the general support category, because it helps to decide where I can help. Since I don’t usually use WordPress, I cannot. For me, that’s the difference compared to other official plugins where support happens in the main category but with a tag. Those are still questions about what happens in the Discourse forum.