I got the same impression. People are assuming that by 'flow' he means uni-directional, as in the arrow of time. He is talking about the fact that 'flow' semant

I got the same impression. People are assuming that by 'flow' he means uni-directional, as in the arrow of time. He is talking about the fact that 'flow' semantically implies something that moves, but movement itself requires time. So to say that time flows would be circular reasoning.