i only know of the orig FastCraft (abandoned since 2014), FastCraft+ (beta) which is now the new FastCraft, dev'd by Kepler (ben woodworth). it seems really solid and constant commits on github. i never heard of this other one.
but yeah, that guy asking how to obfuscate, that was a funny thread.
i just went and commented on his spigot page. it seems that all his latest code is indeed available on GitHub. https://github.com/BenWoodworth/FastCraft