You might have a point if China was the only country that was able to keep their case numbers low, but dozens of countries did even better than China. Perhaps South Korea or New Zealand is to blame instead.
South Korea seems like a bad example, because they had twice as many Covid cases as China with less than a twentieth the population. Actually, it looks like even New Zealand has reported substantially more Covid cases per capita than China, and they're literally an island a thousand miles away from anywhere else. China's low case numbers really are remarkable.