I copied below the access requirements for the Arrival Lounge (2C landside), it's an arrival lounge so it doesn't follow usual access requirements (STE+). As said, opening times and service are limited.
Access to the Arrivals lounge is free to passengers traveling on a long-haul flight in the La Première and Business cabins, passengers in the Business cabin connecting via TGV AIR and Flying Blue Elite Plus members.
https://www.airfrance.us/US/en/commo...air-france.htm