This isn't Apple Swift from what I can tell. Looks like another language, right? Cached version here:

http://webcache.googleusercontent.com/search?q=cache:http://...

It is unrelated to Apple's language. Apple did post a link to it, probably because people googeling Swift programming language will find Apple's and not this one.

It just worked for me, but its down now. The link is here: https://developer.apple.com/swift/