GGG Ping...
Bali was settled from some five thousand years ago by the same Austronesian people who populated and brought rice farming to the to the region as well as those who settled the Philippines and Oceania.
The architecture shown in the photos reflects Hindu influence combined with the Dong San culture from present day Vietnam. Metallurgy goes back into pre history. Burial rites in Bali included the interment of defleshed remains in pottery jars which was used in locations from Tibet to Laos and Southern China.
Bali has resisted Islam and retained a culture that was once common in Indonesia and Southeast Asia with a rather unique architecture due to the Dong Son influence. Other peoples in the large and diverse have quite diverse and unique architectural styles though Islam has largely served to suppress them.
I thought the notion that Amerindians were Polynesian in origin is hardly even considered controversial. The sad thing is that web site is attaching the most ridiculous nonsense this notion.