I think the shorter blurb notion comes from how it would cut short in the preview link you share around.
Suggestion is you condense your blurb to its catchiest part (just some sentences or a paragraph) so it is short enough to be shown in your preview link, then add separator and show your longer full blurb below (which will not be shown in link preview). The shorter blurb draws attention in shared link, and the long one below will give people a clear image when they decided to click. I have seen premium series has two kind of blurbs like this.
I think it is the culture of Tapas, but writers here tend to shorten their blurbs.
That aside, I do really think your blurb can be condensed and made more interesting. It is a nicely worded and thorough blurb, you also mentioned your inspiration which makes familiar readers have easy time to relate. However, I do not know if I am just stupid (sorry ESL, I no spik Inglish) or I cannot get a clear view of what it is about by paragraph two, while paragraph three is not helping. I just get that land goes brr, almighty prince appear, scoundrel, hello I am king, refugee, struggle of power, then things goes kinda okay, but. . . Oh no! Things are more complex than it is appear! Hee hee read to find out.
It is to me more like an explanation of world history or events prior to the actual story people would post in their prologue, not what the actual story is going to be about (sorry if it is, but that would be a synopsis, right?). Maybe you can shorten the world history into relevant bits (like "Struggle of power by prince, scoundrel, king, and refugee to save the land ended up pretty okay, or is it?") and save it for the actual story
Another is, how about you expand the urgency and focus on what happened afterwards? What would happen and why should we care if there is a more complex event at play? How will it take place? Will the prince get a new unicorn? Will the land be ravaged by orcs? Will a pink-haired princess transferred from another world called Korea marry the scoundrel?
I think the purpose of blurb are to give insight, entice, and make reader care about the story. If reader is at loss and cannot form an expectation, I do think the blurb is better be improved.
This is just my opinion, and I am no expert myself. Sorry if I make a mistake or offend you.
Also I don't meant this for feedback exchange. I am not offering one, just commenting on your words regarding the blurb