If I understand this correctly, for some writers, the revision process is like a dog eating its own poop. Because there’s still nutrients in it. So then they poop out an even more refined poop. And the dog will keep doing it until there’s nothing left to get out of the poop or until its master tells it to stop. That master is publication. That’s when you stop eating the poop.
This also sheds an interesting light on literary critics, who would then be likened to scientists who use the microscopes and mass spectrometers of literary theory to figure out what the poop is made of.