Yes you have you X GUI back up, but not with the best slution. The howto says that USE=dlloader will not work with nVidia or ATI drivers, but the patch is step 2 and 3 is a fix for this. I have hardened + xorg + nVidia.
Now that is a fix!
0. Read
http://www.gentoo.org/proj/en/hardened/hardenedxorg.xml
1. Goto
http://bugs.gentoo.org/show_bug.cgi?id=64618
2. Get the xorg-x11-6.8.0-r1.ebuild.diff patch
3. cp patch to /usr/portage/x11-base/xorg-x11/
4. mkdir /mnt/backup; cd /mnt/backup; tar -cvjf dev.tar.bz2 /dev
5. type patch -nu xorg-x11-6.8.0-r1.ebuild xorg-x11-6.8.0-r1.ebuild.diff
6. type USE=dlloader ACCEPT_KEYWORDS="~x86" emerge xorg-x11-6.8.0-r1.ebuild