He mentioned on occasion that it was FTB but he didn't always remember. He added it on to his existing world (though he did travel to get new worldgen) so I'm not sure when it started (though I think I did link the first video in a dedicated thread several months back). The main problem was that he did not do much research into what he actually had and what he could do with it, and he didn't have NEI switched on so he had to either Google the few recipes he used, or do trial and (mostly) error, and he has no concept of proper inventory/storage management so he often chucked out stuff he could have used later, failed to find things he needed, or stored separate stacks of the same thing unnecessarily. He collected quite a few minium shards without ever wondering what they were for, and made a rail line to nowhere for no real reason. He did eventually manage to make a forestry backpack and some longfall boots and even a little bit of bronze, and even discovered that he could smelt granite-cobble back into granite to make his house out of, but I think that's about as far as he got.