There are numerous flights leaving Brasil for Europe at this time of the evening. AF have a B744 flying GIG-GRU-CDG, not sure if this would take the same routing as an ETOPS twinjet though.
Other reports have mentioned a Lufthansa aircraft flying a similar northerly track from GRU-FRA that evening and not experiencing any sig wx problems.
I flew back on Saturday evening GIG-LHR on a BA B772, we experienced the usual light-moderate chop for a good few hours from the north east of Brasil, up over FLZ continuring 2hrs north of the Equator on a similar northbound routing. We took significant wx deviation just north of 0 deg before returning back to track.