The light attack concept is simple: instead of building a massive, jet-powered, state-of-the-art mach 3 fighter to drop bombs on camels, go use something that works a lot more like a WWII fighter. After all, they did a perfectly good job at ground attack then as long as there weren't other fighters to shoot them down, which matches fairly well with the conflicts we fight today.
And they're cheap. Prices for these should be close to parity with current drones, if not less expensive, and operating costs are low as well ($600/hr instead of $15,000/hr, per the article). I'm not sure how they managed to get the project going, but I wish them success before someone realizes they're not spending enough money and kills it.