A hernia will not get fixed by cleansing. Whoever said it would is way off and just plain wrong. Can you link to this advice?
Theoretically, cleansing could clean out the digestive tract, thus reducing constipation, thus reducing straining when eliminating bowels, thus reducing the chance of causing a hernia... or something like that as a *preventive* measure...
But to heal an *existing* hernia? No.