It should be relocated at Dalek Prime because chronologically, this is still the same old Dalek Prime. The official DWM illustration confirms this as the intention, even if it's not valid in and of itself. A separate page is like acting as though, in a Third Doctor story where he battles "the Master", a man in a black suit and beard, we were not sure it's Delgado as opposed to an unknown incarnation in-between Delgado and Pratt.
Talk about it here or check the revision history for additional comments.
First sending Daleks to obtain the knowledge of the Library on Kar-Charrat, (AUDIO: The Genocide Machine) the Emperor later launched an invasion of Mutter's Spiral. While it successfully conquered much of the galaxy, its real goal was Project Infinity, as it intended to summon Daleks from another reality. When those Daleks turned out to be appalled by genocide, the Emperor was captured by the Earth Alliance, (AUDIO: "Death to the Daleks!", Project Infinity) but transmitted its consciousness into the human Susan Mendes to continue the war. (AUDIO: Dalek War: Chapter One)
It erased her consciousness and intended to use her form to con the galaxy into lowering its guard; however, a psychic trap caused the remnants of Mendes to awaken and trigger the destruction of all Dalek technology, removing the Emperor from its human host and resulting in the Great Catastrophe. (AUDIO: Dalek War: Chapter Four)