I don’t understand the significance. 20,000 years is plenty of time for humans to migrate from Africa to China.
It doesn’t even have any bearing on the evolution/creation question, as long as you’re not sticking to a 4004 BC creation belief. And then you can just doubt the accuracy of the time measurement.
Sure it’s plenty of time, but this find forces a complete rewrite of human origins theory. Did you read the article?