Actually i think theyre all different things.
As in aog ether is not gin is not longinus
真エーテル is not 架空 is not 真説
I think 真エーテル made up old gods, declined and then its just ether by association definition, and then ??? blew up and later on its gin?
Reasonably sure that you cant call gin true aog ether.
But really who knows
Ether is weird