We don't do Zope anymore. Please consider lastriting :).
What's the lastrites procedure for an eclass? cvs rm -f zproduct.eclass && echangelog && cvs ci ? Or do we need to send mail and make it call die for some arbitrary period of days?
https://devmanual.gentoo.org/eclass-writing/index.html#removing-eclasses Though not sure if we need all that considering that the eclass depends on already removed packages.
+ 12 Jun 2015; Mike Gilbert <floppym@gentoo.org> -zproduct.eclass: + Remove obsolete/broken eclass, bug 551918.