The way I think about it - the higher your fat content in your diet the likely the higher amount of fat (cholesterol) circulating in your blood veins. It might not be a big deal if your body doesn't attach that fat the walls of your arteries however if you have inflammation in your arteries the fat will attach to the arteries and over time that causes a whole host of problems. My unqualified suspicion is that if you manage inflammation you likely won't arterial walls lined with cholesterol (which is trying to repair the damage to your arterial walls from inflammation).

However I also suspect that as you get older your vein structures change and theres probably a time in your 30s-50s where you biology changes and you start adsorbing more cholesterol (from fat) onto your arteries that cause CVD.