Hello! Ryan here, aka @ransomyu on the forums (don't bother looking, I'm just a lurker) and as Paradox' first (I think?) Filipino hire, I was delighted to be asked to consult on these Filipino units. My first Paradox game was CK2 but I fell in love with EU4 when I realized you could take one of the precolonial Philippine polities and essentially rewrite history by ensuring the islands were never colonized by European powers. Doing so with these newly designed units will make it a little bit more exciting!
As previously mentioned, the Philippine archipelago is a rich tapestry of different cultures, languages, and traditions. For example I have Kapampangan and Tagalog roots, but was essentially raised in (Imperial) Manila. So when I helped do the research on what units could represent the entirety of the Archipelago, I defaulted to suggesting what was most popular in the national imagination and mythology. So for example while Lapu-Lapu is Bisaya, he is the stand in for Filipino anticolonial aspirations, and features heavily in any media that aims to depict precolonial Philippines.
I hope that any Filipinos that play EU4 will be super pumped to try out the new DLC and join me in my quest to insert as much Filipino flavored content into Paradox games as humanly possible!