I can get the gist of what you're going for, but if you're concerned about missing context, your preface has a ton of references that make sense in-setting (given that this is an in-universe document) but that I have no idea the meaning of. We can deduce the general meaning, so your prose is functional, but if you don't want to be talking about stuff that lack context that's a problem. I can figure out pretty easily that the "Dark-Markets" are some sort of system of chattel slavery but it still lacks context.
I don't think this approach works if you're worried about your writing missing context. You might consider just introducing your character immediately, since they are presumably unfamiliar with this and would learn along with the reader.
If you don't, I'd still suggest trimming this down a lot. Particularly clunky chunks include:
The day-time was the Eighth of Krane, Two-hundredth and Sixteenth Revolution. The Histan Duke's Realmologists had gathered at the annual Worldly Convention as they revealed the final Model of the Multirealms, proposing a most perplexing theory stating that the then-supposed Multirealms exist on the same point. The only tangible explanation I could ever give you is this: Imagine you have a map of Junti, Lagrat, and Winhe.1 Place these maps on top of one another and stick a thumbneedle through any point on the top map. Maybe you have placed Lagrat at the top and have pinned the capital city Mayfud. You might have also placed Winhe in the middle of the stack, hopefully perfectly aligned with the other two. If you were to lift the map of Lagrat and track the needlehole made in the map of Winhe, if done right, it should have gone through the town of Kiflet. Furthermore, another needlehole should be in the Junti town of Ufton. In short, one location in one realm shares a point with another location in another realm. It's hard to explain.
I'd suggest revising this to something like:
The date was the Eighth of Krane, 216th Revolution. The Histan Duke's Realmologists had gathered at the annual Worldly Convention as they revealed the final Model of the Multirealms, proposing that the--hypothetical, at the time--Realms were coterminous. Imagine you have a map of Junti, Lagrat, and Winhe. Place these maps on top of one another and stick a needle through any point. Maybe you have placed Lagrat at the top and have pinned the capital city Mayfud. Let us also imagine you have placed Winhe in the middle of the stack, aligned with the other two. If you were to lift the map of Lagrat and track the needlehole made in the map of Winhe, it should have gone through the town of Kiflet. Furthermore, another needlehole should be in the Junti town of Ufton. In short, one location in one realm shares a point with another location in another realm.
You can see how this used fewer words to say the same thing.
Also, I don't think the casual tone works for this. Firstly, it's academic writing. Departure from academic tone has to be done very deliberately. Secondly, you're talking about mass forced population movement and slavery, sex slavery at that, so your narrator looks like an asshole. And… well, since the only text in front of us is that and the premise includes "catgirl harems", the reader's going to assume that the book isn't going to treat the subjects with the seriousness deserved.
