This idea has been around for several years; I only became aware of it through a chance Youtube-suggested video, on enemas. The mechanism seems to be (I'm not certain) that clean warm or hot water, introduced anally into the guts, by an enema, precipitates or loosens gut contents (complete with acid, breakdown products, mucus and what have you) to generate artefacts somewhat like tapeworms. It's a similar process to 'diagnosing' 'Morgellon's disease' by a process (staining oral food detritus with red wine) which is misinterpreted.
What interested me as much as anything else is the inability of medical professionals to explain what these things are, and why they form. I couldn't find well-written statements anywhere online.