No you probably wouldn't have known that, but at the same time I can't fault the remake for kind of expecting you to know something about FF7 lore, it is a remake, really it should be called a reboot not a remake because it is mashing all the previous FF7 material into one, but I aint gonna get into semantics.
They would be better served referring to it as a reboot rather than a remake if that's the case.