There are certainly enough commits since 2013 (up to 2019) to warrant a new snapshot, provided someone is still using/wants to work on this.
$ GENTOO_MIRRORS="" ebuild pmount-gui-0_pre20130806.ebuild fetch
>>> Downloading 'https://dev.gentoo.org/~ssuominen/pmount-gui-0_pre20130806.tar.xz'
2021-03-30 02:08:09 ERROR 404: Not Found.
SRC_URI of the snapshot is 404
I guess nobody used it in the last years.
Package depends on gtk2
desktop-misc votes for last rites with a long delay and set it to m-n already.
(In reply to Jonas Stein from comment #1)
> desktop-misc votes for last rites with a long delay and set it to m-n
I don't see why it should get any more delay than other broken packages.