Yes I was wrong to say that this an implementation detail rather than a protocol problem as the OpenSSH release notes to prevent this vulnerability include extensions to the SSH Transport Protocol, however I still believe that the headline is sensationalist at best since it can and has been protected against by patching ssh clients and servers. It would be entirely unreasonable in the majority of cases to simply stop using SSH on the basis of this vulnerability and that's why I think the headline exaggerates the problem. The Register has a much more measured take on this including comments from the paper's authors that people shouldn't panic and try to fix immediately.