The time would not pass. Somebody was playing with the clocks, and not only the electronic clocks but the wind-up kind too. The second hand on my watch would twitch once, and a year would pass, and then it would twitch again. There was nothing I could do about it. As an Earthling I had to believe whatever clocks said -and calendars.
The Tralfamadorians can look at all the different moments just that way we can look at a stretch of the Rocky Mountains, for instance. They can see how permanent all the moments are, and they can look at any moment that interests them. It is just an illusion we have here on Earth that one moment follows another one, like beads on a string, and that once a moment is gone it is gone forever.