I would be immensely skeptical of this unless he was talking about something much more narrow, like how there's a fraction of people who have really unfortunate genetics and can only improve their blood lipids with medication.
We have mountains of data showing that diet can massively improve lipids, and the combination of diet and exercise are our largest levers for reducing the risk of heart disease for most people. (There are always some fraction of people who can do everything right but have outlier genetics that require medication anyway, just as some people have outlier genetics and can smoke a pack a day their whole lives and reach their 90s.)
I'd check out the Barbell Medicine podcast for anything related to the intersection of lifestyle and health. They're extremely evidence based with a preference for measurable improvements in outcomes over hypothetical mechanisms.
Relevant to this thread are their episodes on testing and screening, hypertension / high blood pressure, cholesterol, fiber, and the new PREVENT heart disease risk calculator.
I'd also check out the episodes on diabetes, Alzheimer's, fatty liver disease, and health priorities.