I didn't mean to imply that they are copying the open source code directly. Without a copy of their code, it's wrong to make that assumption. I'm saying that their entire rendering process, as described in the video, sounds suspiciously like what other people have released in whitepapers and source.

It probably is a completely original implementation, but I do not believe that any of the algorithms being used are original. That is where I think Notch is coming from when he calls it a "scam". It's piggybacking on other people's work, while claiming that it's their own.