I was enjoying the interpretation that each of them gets their own magical world optimized as they see fit, which would be such a lot of fun, though I agree that the "all but a remnant" line shoots that down, unless you want to be really dodgy in your interpretation of it (e.g. Harry's mortal body dies, but he gets uploaded).

Just leaving the Pioneercrux going slowly out to infinity, to possibly have Voldy reform in a galaxy far, far away means that we don't get any actual story in space. (Well, it doesn't necessarily eliminate the possibility, but makes it a whole lot less probable). And my assessment of this fic is that Eliezer really can't resist bringing magic to space for several chapters, because a) he's demonstrate a need to constantly escalate in awesome; b) as a reader, I expect all the hints of magic-in-space to come to something significant; and c) just think of all the references he would include to every SF ever.