There is now evidence that proves that some of the Amerindians are related to both Polynesians and southeast Asians.
This genetix and anthropogy study says the Spanish transported Native Americans to the Philippinea and 7% of Filipinos are classified as Native American.
"Classification Trends among Contemporary Filipino Crania Using Fordisc 3.1"
https://www.academia.edu/38744342
[Page 1] ABSTRACT: Filipinos represent a significant contemporary demographic group globally, yet they are underrepresented in the forensic anthropological literature. Given the complex population history of the Philippines, it is important to ensure that traditional methods for assessing the biological profile are appropriate when applied to these peoples. Here we analyze the classification trends of a modern Filipino sample (n = 110) when using the Fordisc 3.1 (FD3) software. We hypothesize that Filipinos represent an admixed population drawn largely from Asian and marginally from European parental gene pools, such that FD3 will classify these individuals morphometrically into reference samples that reflect a range of European admixture, in quantities from small to large. Our results show the greatest classification into Asian reference groups (72.7%), followed by Hispanic (12.7%), Indigenous American (7.3%), African (4.5%), and European (2.7%) groups included in FD3. This general pattern did not change between males and females. Moreover, replacing the raw craniometric values with their shape variables did not significantly alter the trends already observed. These classification trends for Filipino crania provide useful information for casework interpretation in forensic laboratory practice. Our findings can help biological anthropologists to better understand the evolutionary, population historical, and statistical reasons for FD3-generated classifications. The results of our studyindicate that ancestry estimation in forensic anthropology would benefit from population-focused research that gives consideration to histories of colonialism and periods of admixture.
https://filipinokastila.tripod.com/FilMex.html
National Geographic posted an (Outdated) genetic study (Outdated because the tech they used was a decade old) showing that 2% of the Philippine population is Native American.
However, you can calculate the Latin-American admixture in the Philippines yourself if you check the census records.
Census records show the initial total population of Spanish-Philippines based on tribute estimates is 667,612 in the 1600s (The Philippines was fresh out of a series of wars so population was reduced)
https://www.gutenberg.org/files/38269/38269-h/38269-h.htm#pb161
At the same time in the 1600s, the total number of soldiers from Mexico and Peru that settled in the Philippines was 15,600
https://academic.oup.com/past/article/232/1/87/1752419
15,600 Latinos out of a Philippine population of 667,612 = a percentage of 2.34% meaning 2.34% of the Philippine population are made up of Latino immigrants.
This source:
(Page 103)
State that the children per woman averaged between 2.51 to 4.16. So let's say the average Filipina then had three children per generation. At the beggining of Spanish colonization, Latinos form 2.34% of the Philippine population...
Now the Viceroyalty of New Spain's rule of the Philippines lasted from 1565, to 1821, the year of Mexican independence.
That means that Latinos ruled and sent soldiers to the Philippines for 256 years. You divide that by 25 (The number of years for a generation to grow up and reproduce again)
So there are 10 generations where the Latino descent is multiplied by 3 (3 children per women according to the source)
2.34 x 3 (children) per generation = 7.02%
So the math adds up lol! The study that said that 7.3% of Filipinos are Native American corroborate with census calculations that factored in Latin American military settlement from 1565 to 1821.