The author of that comic, John Byrne is a crazy right wing bigot, but the story is canon.
My concern is that "Zaora" there, is the last female Kryptoinian in existence.
Love/shmuv, that was possibly Kal-El's last and only chance to have a baby.
And he just kills her?
Artificial insemination, or just coming to an agreement (pun intended) where Zaora could have bought their freedom, or bargained down their sentence from an execution to life imprisonment in exchange for X number of pure blooded Kryptonian children using El spunk and signing away her parental rights.
Of course, Superboy, Zaora, Zod and Non (and the Earth, and everyone/thing on it) are fake constructs created by a baddie called the Time Trapper to give the legion of super heroes form the 30th century adventures with what appears to be a precrisis Superboy, who does not exist post crisis. Double of course, Superman did not know this, and he thought at the time that he was killing real people.
My point is that these pocket universe fakes are not biologically identical to real Kryptonians from the greater Universe, considering each of these different versions of Kyptonians "respond invertantly" to totally the different minerals called Kryptonite that are not the same rocks, they both swear are real Kryptonite.