I suspect the above fare rules are not accurate. The 'Business Flex' ticket validity is shorter than 'Business Standard' - sounds not plausible.

And these rules are different in the Chinese version, which states no stopovers and 12-month validity for 'Business Standard' and 2 stopovers and 12-month validity for 'Business Flex'. These rules are consistent with the detailed fare rules you see when you do a dummy booking on the website. So I believe the Chinese version is correct.