30 % of the population have genetic makeup such that they can smoke all their life and not increase their risk of lung cancer by much, yet it's deadly for the other 70% of the population.

Many many studies over many decades, reviewed and controlled for other factors have showed that consumption of saturated fat increases heart health issues leading to death in the majority of the population. Finland and Norway have reduced the number of CVD at the population level by educating and pushing for a reduction in sat fat. You are probably one of the few exception.

This, and the infamous seed oils are subject on which Attia has controversial opinions - he is not an expert on nutrition, nor an epidemiologist, but neither am I, so my advice would be to broaden your sources of information.

Having said this, is the thing about PUFA the results of the studies from Walter Willet? I've just watch Chris MacAskill (Viva Longevity on YouTube) talking about it, it seems that PUFA (fatty fish, walnuts, sunflower seed oil) has the most positive effect on triglycerides across the whole population, and beyond reducing saturated fat and increasing fiber intake.