I've been studying Linguistics full-time for ten years now. I have a B.A. in it, I have an M.A. in it, and I've almost got a PhD in it. This site is certifiable bullshit. It's true that you can learn A LOT in the span of three months. You'll easily learn enough to survive and function in a lot of places. However, the notion that you'll be fluent is flat out wrong, and has been scientifically proven to be the case countless times. The page's blatant disregard for actual research is just insane.
Fluent in 3 months
Cool site about learning a language. Thanks to backintheair.
Language hacking tips from Benny the Irish polyglot