An Update on GRU: AF moved out of the W Premium Lounge (thankfully), into the Safra (former Star Alliance lounge). There is a dedicated space for LP pax at the back of the lounge (an area which was previously used for LH/LX F pax).
With the new time of the LP flight out of GRU (2:40pm), I guess the lounge will not be particularly busy. I doubt they would be able to use that area for the evening departure, as the lounge gets super crowded there with the US/EUR departures.

Heres’s a picture of the space: pretty big for maximum 4 pax (or 8, if each brings a guest). In the prior configuration, I want to think this area accommodated about 25 people or so.