I don't see how this "discredits" homeopathy. From the homeopathy viewpoint, the remedies themselves are not considered (i.e. by homeopaths) to be drugs, or even equivalent to drugs, and taking large doses wouldn't be expected to have any particular effect. It's a bit of a straw man argument like saying "Your cheese isn't really chalk because I can't write on the blackboard." But I never said it was chalk or that it's purpose was to write on blackboards. What have you really proved except that it's not a drug, which was never in question.