throwing out random, unsourced historical fragments does not change the fact that the video completely lied about the modern data.
There is no publication from the New England Journal of Medicine in 1891 establishing that cancer, multiple sclerosis, or bipolar disorder are caused by parasites. In 1891, the medical community was just beginning to grasp cellular pathology and basic microbiology. If you are referring to historical experiments from that era, such as William Coley's work with "Coley's Toxins" in 1891, he was utilizing bacterial injections to stimulate an immune response against tumors, which had absolutely nothing to do with treating parasites.
Conflating completely distinct, complex biological conditions like a neurological autoimmune disease, a psychological mood disorder, and malignant cellular mutations, and attributing them all to a single boogeyman like "parasites" is a massive failure in basic pathology.
An antiparasitic medication cannot distinguish between a malignant tumor cell and a healthy human cell because both are eukaryotic. The only reason certain benzimidazoles are even being investigated in labs is because they happen to inhibit microtubule polymerization during cell division, a mechanism that applies to rapidly dividing cells in general, not because the cancer is secretly a tapeworm. Stick to the actual science instead of historical myths.