There's some discussion in the comments, including some (little) elaboration from Eliezer, the author, in a comment at 5:27pm on 2009-02-02 and another at 12:33

There's some discussion in the comments, including some (little) elaboration from Eliezer, the author, in a comment at 5:27pm on 2009-02-02 and another at 12:33am the following day.