Oh, I think thats a bug, its kind of standard procedure to point to 200 node discussion resulting in a commit

the commit thats missing the references remove all old OO tutorials (and perlbot)
155 node thread Revising Perl's OO docs - a new OO tutorial - nntp.perl.org
50 node thread Revising the OO docs - take 2 - nntp.perl.org