Cost of Living comparison between Naha and a coastal US city with an average COL for the US: How accurate do you think this is?

Numbeo COL comparison between Naha and Ft Lauderdale, FL

I chose Ft Lauderdale because it's a coastal city that Numbeo ranks as having an average COL for a US city.

I'm surprised that Numbeo ranks Naha as drastically more affordable. (Granted, there's not much info to compare, mostly rent and restaurant prices.)