Earlier quoted context omitted.
Then how do Asian kids do it by age 1?
I assume you're referring to China, since "Asia" is a big and diverse place. The Chinese use elimination training, or "potty on demand." You place the kid over the potty, make a specific sound they associate with going potty (you created the association previously) and they go. You then repeat this enough times in a day to eliminate the need for diapers. I don't think elimination training is potty training. In potty…
And yes, I do/did have some very close friends from Mainland China, but always like the Taiwanese better.