It is wrong to demand "historical accuracy" in alternate reality fiction, instead look at it from the lens of "internal consistency" and "plausibility".

An advice for foreigners visiting the Philippines or when interacting with Filipinos online

Debunking, once and for all, the myth that Tagalog and Filipino languages are one and the same.

Short answer: No. Philippine Ube, Taiwanese Taro, and the Okinawa Purple Sweet Potato are distinctly different.