If they are going to have another leg in Argentina, then i think there is going to be another non elimination before Santiago, because Pablo & Rosario were eliminated in 8th place in Santiago. So, if there are going to be 2 legs in Uruguay, Santiago would be leg 6.
Leg 1: El Calafate, Argentina

- Non Elimination
Leg 2: Buenos Aires, Argentina

- Elimination (11th Place)
Leg 3: Tigre, Argentina

- Elimination (10th Place)

Leg 4: Colonia del Sacramento, Uruguay

-
Elimination (9th Place)/NEL 
Leg 5: Montevideo, Uruguay

-
Elimination (9th Place)/NEL 
Leg 6: Santiago, Chile

- Elimination (8th Place)
Leg 7: San Pedro, Chile

- Elimination (7th Place)
Leg 6: Antofagasta, Chile

- Elimination (6th Place)
The other NEL is probably leg 9 or 10, assuming that last leg will be a double leg as usual.