The US is the world's largest economy, roughly 70% larger than China in fact.
That's a bogus article, that is more link-bait than substance - which is why nobody has taken it seriously. The author is patting their self on the back for forecasting an event they then self-proclaim to have taken place.
"So a Starbucks venti Frappucino served in Beijing counts the same as a venti Frappucino served in Minneapolis, regardless of what happens to be going on among foreign-exchange traders."
If a person in China making 10% of my income can buy as many Starbucks coffees as I can, that does not mean we have the same economic power or scale. I can buy a BMW, and they cannot, and that tells you the real story.