Yeah now I think about it, it's possible that ES was in SE Asia or Australia. Then a flight to Sao Paulo from Sydney or Auckland.
Yes, it could have been there but why not South America? There are plenty of nice resorts to send them to along the Atlantic coast in Brazil, or to an estancia in Uruguay or Argentina or even to somewhere near Santiago. The 2 places I know for sure that have non-stop flights from Auckland are Santiago and Buenos Aires and from Buenos Aires you can get to Uruguay or Brazil.
Maybe they chose Elimination Station for Australia or South-East Asia because a majority of the early eliminations took place in that part of the world. We know they were in India until Leg 5, maybe even Leg 6.
It would minimise costs to keep everyone in that part of the world, for example, getting Amanda & Kris a flight from AUS to for example Sao Paulo, getting Mel & Mike a flight from Japan to Sao Paulo, Jaime & Cara a flight from China to Sao Paulo - that would be more expensive than keeping them all in, for example, Australia.
I dunno, I'm just speculating here.