Personally I'd be very concerned about having FH-like cholesterol levels. And a CAC of 0 is not a free pass as below:

"About one-fourth to one-third of the total incident cardiovascular disease (CVD) events occur in those with a CAC of zero ..."

"Certain groups of individuals (especially younger individuals and women) require even more careful attention"

" Calcified plaque (detected as CAC on computed tomography imaging), however, represents a small proportion of the total plaque burden. Hence, there is a disconnection between zero calcium and zero atherosclerosis"

"Women have also been shown to have significantly lower CAC, with 83% to 95% of younger women (age<50 years) demonstrating a zero CAC . Even in middle-aged women, only about one-third demonstrate a CAC of >0. Despite this, about one-third of CVD events occur in those with a CAC of zero and another one-third occur in those with a CAC between 0 and 100"

"Although a CAC of zero in a younger individual is normal and expected, it has a lot more power at an older age. One might say that, like fine wine, the value of a CAC of zero increases with age. Hence, although a CAC of zero is desirable, it is far from perfect, and decisions to defer care should be considered carefully, especially given that one-fourth to one-third of ASCVD events, even in the short term, occur in this group, and long-term risk is not well studied"

Zero Coronary Artery Calcium Score Desirable, but Enough? 2020

https://www.ahajournals.org/doi/full/10.1161/CIRCULATIONAHA.119.045026