I agree. But I happen to think there's not many elements of Nuperman I like except his dead parents and lack of marriage.
The origin flashbacks in Superman #1 are where a merged Superman needs to continue to go. But we cannot have these two main Supermen IMHO, even if Nuperman is "dead." One main Superman, one Kal-El IMHO and DC better get it right.
Merged Superman for me would be: Merging of all prior continuities (the big things happened near the same way, smaller things did not), underpants were a prior costume for new merged Superman, no marriage, Ma alive or both parents dead (Pa died ala Donner's film), pre-COIE-ish Jor-El & Lara like the latest Superman #1, red & blue rocket like the latest Superman #1, Fleischer and other old media stories all (vaguely) in for the classic fun of it, new very simplified very pre-COIE origin, Silver Age-esque powers, etc.