Suppose that FT used USD 135,000 and the data comes from CEIBS, who reports an average starting salary of RMB 300,000. This indicates that the PPP CEIBS used is 2.22RMB/USD. This means that in China, 2.22 RMB in China can buy similar kind of goods as 1 USD in US. You should ask CEIBS directly of what PPP they used.