Somer - I think you nailed it. Back in the 70's when I started learning about all this stuff, nobody would EVER do a fast for more than a couple days without enemas. Toxins aggregate big time while fasting.
One major reason to fast is to revitalize your digestive system. But the toxins can end up burdening the liver and other organs even more. The coffee enema is a great way to both strengthen the liver and help remove toxins from the fast.
Enemas aren't especially fun (for most people anyway) but will make the fast easier to tolerate and better for your health.