The 10.8+ requirement is unforunate, but unavoidable as Xcode on 10.9 (which I use) doesn’t support building against any earlier OS version.
Unfortunate, though somewhat expected as other game companies are slowly dropping 10.6 as they upgrade Xcode. I thought there was a version of Xcode that supported 10.7 through 10.9?
Your FAQ needs to be updated. It still lists 10.4.