From the linked article:
"with domestic production of the iPhone and iPad providing a means by which Apple could avoid hefty import taxes in one of the world's most populous countries. "
I don't know any of the details, but I would assume Foxconn is performing the absolute minimum level of assembly necessary to meet "domestic manufacturing" requirements. So it is in no way an effective counterexample.
Plus, Brazilians are used to long supply-chain delays (like major supermarkets in major cities running out of Diet Coke or Ruffles) in a way that Americans will not put up with. Something tells me Foxconn's Brazilian factory may not be too different.