the packages are "deprecated" in Entropy, since they are no more upgraded, no more in Entropy Tree (not upgradable) because no more supported for Gentoo.
although they are deprecated... sometimes these packages are working and are used, they are not orphaned.
if you or your system uses the old packages, you should mantain them installed, not removing. remove will remove working packages.
In one my example. Portato (GUI for Portage) is deprecated, no more in Entropy, no more in Sabayon or Gentoo. Bui i enjoy Portato. for this i mantained it, although it no more updated.
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE