It does make sense when you know why and how it happened. I have to correct misinformation in your last post: 1) nobody here has stated at 15 years after the Great War Luna will look that way; it's a slow process, hence the reason why I said that it started in the 2350s. In the 2380s, it may be still in process. 2) there's no such thing has the "human faction" you mentioned. Factions changed over the time due to alliances, wars, and discoveries, so you can't act pretty much as if the GTA as you know it will suddenly become capable of terraforming Luna and building enormous fleets.
jr2 got it right: Shivans. Technology of the EA is more akin to Shivan technology (that's why any conventional assumption on economical efforts is not precise) for reasons that will be explained. It is convenient, and even a lot, but the EA will pay the price of such technology since the first encounters with the Shivans in INF SCP. I can't tell you more about the matter, however.
Oh, because someone has mentioned Venus, I'd like to say that it won't be terraformed at the time of INFASA. While terraforming is cool and necessary to explain the EA boost, it's not going to be overused.