Everyone saying "MIKE IS A LIAR!" I mean get a grip.
I just watched the clip and he said they "finished it" exclusively for the game. Not recorded, not wrote, finished.
razorrednoise, but I'm not sure I'll really be on. I reinstalled it to try and fix a constant crashing problem but ofc that wiped my progress. I don't know if I can be bothered doing what I did again 8-)
Unless the package is put together in such a way that you can dive into the files and yank it out without completing the game.
I don't know how these things work.