The only argument they have here is that they use GB300 GPU's
I don't follow events closely, but the US has constantly flipflopped on what sort of GPUs the Chinese are allowed to have, not in small part because much of the AI boom's valuation is based on demand for US-made hardware, for which the Chinese have inexhaustible and well-financed demand.
So even this feels a bit hypocritical to me, but my understanding is that Chinese native AI hardware is getting good enough that labs dont feel a huge disadvantage by being forced to buy at home, even if they'd have preferred to buy US chips.
Which is a situation that was manufactured by the constant thread of having their access to advanced GPUs revoked.