The "story" of Rebel Inc: Escalation is not a linear narrative but a deep political and military simulation of post-conflict reconstruction. Here is the overarching premise and gameplay structure:
The Premise: "The War is Over, but the Battle has Just Begun"
The text you quoted refers to a specific version of (v1.3.0.2), often found on third-party download sites. This version includes the Sand & Secrets DLC, which introduces the Golden Sands region and the Oil Merchant governor.