That lecture is by a doctor who had widely discredited views on cancer, often cited as an example of quack, pseudoscientific claims on the topic.

His claims, specifically on cancer, were widely and roundly rejected by the scientific and medical community. This is not a controversial statement, either - his supporters proudly proclaim that his views are rejected by the vast majority of experts which, in my opinion, pretty much sums it up.

I highly recommend people avoid falling into this dangerous rabbit hole.