Not nearly into the SW lore enough nowadays to respond adequately to that. I'm old enough to have seen the original release in theaters, and I never heard that justification back in the decade or two that followed. As such, it honestly sounds like a retrofitted justification someone was finally able to come up with. And even that still sounds sus because of the time-dilating effects such celestial bodies would cause (although this is sci-fi, so I'm sure there can be a retrofitted explanation of how to get away with that, too).