Hello David, at the moment, the MB Custom Table still relies on the custom post types to store the post data such as post title and post content. It supports only saving custom fields in the custom tables.
We're working on an enhancement that brings more power to this extension, which allows you to store any content separately from the wp_posts table. That will include both the custom fields and post fields. But it's not ready yet and you need to wait.
Best regards,
Anh