I just checked, that page has no content at all, only a shortcode. So the shortcode content is used. But since it’s not viewed as a page I guess it gives this message.
I have changed to strip the shortcodes instead of running them, you can turn that back if you want to on the “Advanced options” panel.
This way however it will show no description, since the page has no text available, only a shortcode, which is not executed anymore.