No physician or scientist who studies cancer will agree with this advice. "Biohackers" and other frauds posting online do not count as "experts." You can't "starve out" cancer. Reducing carb intake will not help. No "immune boosters" will help. My uncle died from treatable cancer because he followed earnest but terribly wrong advice like this.
Cancer is not one disease. It's not a problem with too many carbs or not enough stretching. To simplify and mislead people like this trivializes a serious and potentially fatal condition.