The article is overall good, but there is an important mistake. The article first incorrectly attributes a vaccine-type response to the active ingredient. This might be how modern practitioners sell homeopathy, but a vaccine-level dose would be many, many thousands of times higher than a typical homeopathic dose.
In fact, at the most commonly used dilution levels, NOT EVEN ONE MOLECULE of the active ingredient is likely to remain.
Homeopathy relies on the belief that after dilution, water’s MEMORY retains the “vital energy” of the substance that was once in it (but no longer is). This “memory of water”–which only exists to the homeopathic practitioner–is what one must believe creates the “like cures like” effect.