Didn't see it listed on there either.
And I have never understood the point of these surveys. Since very few expats I know are living here on great expat packages (as is common in Hong Kong, Singapore, London, NY, et al) it's rather irrelevant. (And you certainly can't compare HK, NY, London, etc to Buenos Aires).
I don't think anyone would argue that if you have a good expat package in a foreign currency, your money would go a lot further here than in any of the other cities mentioned above. But how many people here have that luxury?