This is another situation where there is evidence supporting both sides, and you need to do some critical thinking to determine what makes the most sense.
Shortly after I was diagnosed with MS, for example, I did a ton of research on the links with diet (of which there is very, very little) and what I could find all pointed toward limiting saturated fat to under 15g/day. In fact, the one and only longitudinal study ever done found that capping saturated fat this low (and combining with it a vegetarian or extremely low meat diet) kept 95% of people from progressing with any MS symptoms 30+ years later.
This way of eating really never sat right with me, but this was the very limited evidence available to me, and so I decided to follow it rather than risk life in a wheelchair. After a few years, I wanted to know if this way of eating was really the only way, so I slowly started increasing my sat fat and added some coconut oil to my diet, at some points eating almost a 100% meat and fat diet for several weeks and never had any new symptoms as a result of all this experimentation.
Research can be used to prove just about anything, so I think the burden ends up being on us to find what makes us feel good and what makes sense. Maybe you are someone who feels great eating the way this particular doctor advocates. In that case, go for it! However, following the newest nutrition trends is not always the best thing to do. Saturated fat is abundant in nature and has been consumed probably since the beginning of time (although there is a lot of leaway to experiment with how much or little you require) while refined industrialized 'heart healthy' seed oils are a freakish modern invention that showed up around the time a ton of modern diseases made their debut. You make the call.