China hasn’t even supported Russia with weapon supplies. This is fear mongering a what-if that contradicts Chinese foreign policy in the first place. China’s foreign policy is one of fierce neutrality for anyone not encroaching on their own sovereignty, often to a fault.
China considers both Israel and Palestine to be strategically important allies in the region, so there’s no way they’re going to pick a side in this conflict unless that side is in support of one of China’s more significant allies (Iran, Saudi Arabia, etc.)