As far as I can tell, he seems to be hung-up on the following:
Instead of starting with a beginning-less past until the present, start with the present and go back into the past (which astronomers do with telescopes); you'll simply go on forever and ever.
Instead of starting with a beginning-less past until the present, start with the present and go back into the past (which astronomers do with telescopes); you'll simply go on forever and ever.