EDIT: Yep, I'm just old. Another commenter linked to a "10 cheapest new cars" list and there seems to be a price floor of around $20K. No major manufacturer seems capable of making one cheaper!
You can find numerous new cars for sale in Mexico for under $15k USD.[0] Even Europe has several new cars under €20k.[1] These are the same manufacturers we have here, but lower cost models that are only sold in lower-income countries.
[0] https://compra.autofact.com.mx/blog/comprar-carro/mercado/au...
I was in the market in Mexico last year, just looking for a cheap city car with a warranty for when I am there. I test drove half the cars on that list, the other half I immediately eliminated after sitting in the driver's seat for under a minute.
You can think of those base models like MSRP GPUs right now. They exist on paper, but good luck actually getting one for MSRP.
In the end, I didn't purchase any of those and got a two year old certified preowned vehicle with the top trim and comfortable seats from a dealer with a warranty for about $3000USD more than the cheapest actually available model of those linked in your post.