I've been to Mexico City fairly recently, and I guarantee that in the right places -- possibly the same place the 1986 picture was taken -- you could take something very much like that 1986 picture today (which is perhaps even more tragic today, since its not just after the major earthquake). And I've seen Mexico City pictures just like that 2011 one, barring changes in fashion, from the 1980s. And even the 1960s. On…
Additionally don't most measures of GDP explicitly exclude those cases where the money is immediately siphoned out of the country?
In either case it is usually true that GDP and income per person are at least linearly related, meaning the kinds of comparisons he is doing are valid, since he is comparing the numbers within a country. The scale of growth may be off by little bit, but the fact that growth occurred is still true.