No, they could not. The new supercomputers are using the latest Nvidia GPU's and they can't be sold to China, and are already in short supply. (even before Elon builds his 1 million GPU behemoth.)
China's latest model is great for opensource, but it is still not leading the world. OpenAI is in the lead with O3 and I would expect xAI to pass them soon, since they have an overwhelming compute advantage, which is only going to increase.