Translation: This is the anthropic principle applied to the direction of time.
Basically, he's saying that universes which have a definite direction of time are much more likely to be very large and long-lasting, and have many more opportunities for "observers" (like us, or our particles, depending on whether you've read http://www.sciencenews.org/view/generic/id/35391/title/Do_su... ) to exist, than those which do not have a definite, reliable direction of time.
And therefore, because we exist, we are much more likely to find ourselves in one of those kinds of universes than in one which is not so compatible with life.
This is probably not the most interesting article I've read on OvercomingBias... the others usually make more interesting arguments.
Basically, he's saying that universes which have a definite direction of time are much more likely to be very large and long-lasting, and have many more opportunities for "observers" (like us, or our particles, depending on whether you've read http://www.sciencenews.org/view/generic/id/35391/title/Do_su... ) to exist, than those which do not have a definite, reliable direction of time.
And therefore, because we exist, we are much more likely to find ourselves in one of those kinds of universes than in one which is not so compatible with life.
This is probably not the most interesting article I've read on OvercomingBias... the others usually make more interesting arguments.