Loki really was born with "Cursed Eyes", and his Mother obsessed with Omens/Prophecies...
Combined with Harley Text, and don't forget that his Mother is of "Pure" Elbaph Descent, clearly indicates that Loki is Descendant of whoever wrote that Book,
Just like Shirahoshi is Descendant of First Mermaid who is Destined to Lead Sea Kings once more,
Just like Vegapunk was born Smart, which led him to his Destiny to rebuild a Pluton-Like Weapon,
Just like Blackbeard was born unable to Sleep....
... etc
Loki is Destined to Re-Write History once more, (He still doesn't control his Power apparently)
And this is what Giants call "Judgment of Elbaph", as Dorry mentioned how his Fated Loss against Brogy was decided by such Judgment, even though No Natural Phenomenon happened nor were They in Elbaph nor anyone related to them appeared ... etc showing that it's "Fate" related Powers,
Regarding this Harald Story, it seems to me that He actually planned to turn against both WG & Elbaph, i think those Soldiers turned against him because He wanted to consume the DF, something that's Forbidden to even their Kings, and He eventually Succeeded & fled Elbaph, so Loki just accepted to take the blame, and his Journey on the Sea was actually to catch his Father, but apparently Shanks stopped him, just like He would have wanted to stop Ace from chasing Blackbeard,
I mean the guy is still 51 Years Old in Human Years if He is still Alive.....
It's very sus that Oda didn't make him an Old Man if He intends to Kill him & call it a Flashback,
In other words, i still don't buy Harald is Dead,