Yes, but as XenForo already blocks non-interesting urls for indexation with a Meta, I think it's more "Xen way" they do the same with these urls, don't you think so?
@ManagerJosh: it is a domain registered since two years that consisted in a static page, with 1 Page authority & Domain authority. Although this term has not very much competence, I have the feeling that XenForo works well in that aspect! maybe I'm precipitating a bit, I'll keep you informed about further results.