You should ignore anything on that web page and only refer to Alfresco documentation for Surf from now on (not that there's a great deal of it unfortunately)… as is mentioned previously in this thread, you should have no expectation of Roo or any other STS related working with Surf. It's now all been removed and only the core features remain.
Surf is still being actively developed, but is temporarily not in a public SVN after being removed from Spring Source… we're hoping to have the SVN source visible soon, although the latest source is committed in JARs to the Alfresco Community SVN.