I really don't see what's so strange or universe shattering regarding the information on Eligor... What's the big deal again?
What Toriyama is describing Eligor as, is essentially a malevolent psychopomp. A death omen. In folklore, there exists beings who, upon sensing upcoming great loss of life, come to witness it and serve as heralds of death. Psychopomps are beings drawn to death and mass losses of life, who then lead those souls to the next world, like in essence, the Grim Reaper. Or the Mothman. Or any other death omen creature. Time travel doesn't have to factor in with the sensing of impending death, it's something those connected with death and upcoming tragedy can sort of just "sense." Like a feeling in the air, or an observation of circumstances around the area.
Eligor is a "A ghastly fiend that haunts the train graveyard and feeds on human fear to grow stronger. It is a manifestation of the memories and sorrows that linger in the train graveyard." And I think it's a fair assumption that the mass loss of life and destruction that would result in the Sector 7 plate collapse would give it a feast that it would not want interrupted. It would easily sense the life-threatening terror, potential for more carnage and then wish for that to happen without interruption. Like a twisted Bodach Glas ensuring death comes for those it targets.
I think that's an incredibly cool detail of lore for it. I sorta got the feeling the ghosts and Eligor were somehow mocking/taunting Cloud and the others with the upcoming plate collapse, with the train radio suddenly being able to magically pick up the radio chatter of the Turks just when they confirm they are actually going to drop the plate.
And then right after, more ghosts and monsters attack, as if trying to obstruct your progress. Then of course Eligor himself stopping you at the exit. I didn't think it was that explicit but it certainly was a feeling that was conveyed by the events... That the malevolent ghosts and Eligor wanted the deaths to happen. So this confirmation is certainly pretty awesome and interesting.