"he learned from his mainstream doctors that if "you feed your body, you feed the insatiable voracious appetite of the cancer."
mm. (I would laugh, but won't, out of respect for his greater self) That's what I intuited was his POV. Classic case of projection of one's hidden (or perceived) 'demons' outward. Naturally then, you'd go looking (outward) for answers from the very minds that feed on sickness.
"he learned" sums it up.
What's really criminal though is the utter deceit in 'teaching' such stuff as his doctors taught: what an immoral way to cover up "feeding" the poor, starved and enervated body their drugs and poisons.