Maragtas summary

I was recently doing a Madyas campaign (very fun btw) and got interested on the historical basis for the nation in real life.
In EU4, Madyas is a Barangay in the Phillipine islands of Panay and Buglas. It is known for having a strong navy and for being a republic among the many monarchies of South-East Asia.
However, there isn't much evidence for this nation actually existing. Madyas is only attested and described in the "Maragtas", a book by Pedro Alcantara Monteclaro (Phillipine poet and govt official) based on the oral tradition of the peoples of Panay island. More speficically, it depicts the "Bornean migration legend".
In summary, this legend tells the story of 10 Bornean "datus" (sort of "chiefs") who fled to Panay from a tyrannical ruler, and, there, according to Monteclaro, founded the Confederation of the Madya-as (Madyas).
The fact that the book is based on a legend isn't actually the problem though. Oral tradition can be really helpful for historical research, as these stories often point to true past events. Nevertheless, it is consensual among historians[1] that this legend is nothing more than a folk story, not actually depicting actual historical events. Some authors, such as W. H. Scott, even go as far as to say that the Maragtas is really a work of fiction written by Monteclaro (though that notion has been contested by other scholars.)
But, for whatever reason (possibly for game balancing, I believe), this non-existant (or better yet, mythical) nation is present in the game. I looked around on the forums but apparently no one has ever noticed this, though that's understandable as good sources for pre-hispanic Phillipine history can be a bit obscure and hard to find.
Sources:
Talaguit, C. (2020). Mga Maragtas ng Panay: Comparative Analysis of Documents about the Bornean Settlement Tradition. De La Salle University, History Department. [1]: p. 29.
Scott, William Henry (1984), Prehispanic Source Materials for the study of Philippine History, New Day Publishers, ISBN 971-10-0226-4 (through Wikipedia).
edit: H. W. -> W. H.