Yes, drinking coffee and taking it as an enema have very different effects, and I have experienced the coffee enema as a much needed relief during difficult times of 'herxing" or detxoing, which is not easy for me.
I am no expert, but from what I understand, coffee enemeas which you can make yourself at home (not sure about the one you mentioned in your medicine cabinet?) help the liver to create the powerful anti-oxidant called glutothione at a 700% increase. Glutathione is amazingly healing to the body and can even chelate mercury when it couples up with another protein that the body creates.
Dr. Gerson popularized the CEs and they are still used today in his clinic, up to 5 a day for cancer patients, along with 13 fresh 8 oz. veggie juices a day. He observed in his clinical practice that cancer patients didn't die of the cancer itself, but of the septic toxicity accumulating in the liver due to the toxic overload of the body fighting the disease. This is why he employed the CEs, to relieve the liver of septic overload.
I wish I understood CEs better, but have been pretty sick and found them to be a total lifesaver as I just don't have the energy to flusht that often, and the CEs give my liver a fresh cleansing with little effort or prep and can be done anytime in the comfort of my home night or day.
I also have passed much liver "debris" if you will after the CEs and parasites also. They are very cleasning to the liver but I don't think they could replace the LFs, but could definitely be something you could do on a daily basis in between flushes. As you know the flushes release a lot of bad stuff, the glutothione from the CEs can clean that stuff up and neutralize it in the body.
People always warn with doing the CEs to make sure you are replacing electrolytes in the form of fresh juices, etc. I don't know how important this truly is, but it's something to be mindful of and to watch for. I ususally take one CE a day when I am feeling poorly and then do 2 juices and a the water of a few fresh Thai Coconuts and I am hydrated.
Wishing you health today!