You might want to further investigate that claim as I haven't seen any definitive proof that K2 (MK-7) can remove or regress calcium, I remember reading a study posted from the American Heart Association about that recently so here it is. I think the goal with a high CAC score is to stabilize soft plaque with statins which in turn actually increases calcium buildup, but the calcification seems to be more stable then that gooey stuff that breaks off and causes all sorts of trouble.
https://www.heart.org/en/news/2022/04/25/despite-hopes-vitamin-k2-supplements-fail-to-slow-calcium-buildup-in-heart-valve