Hadn’t ever heard of that theory of arteriosclerosis.
The hygiene diagrams will doubtless tell you to use flat floss and do a careful tooth hugging thing from the top down to the gum on each side. I don’t know if there has been scientific comparison between that degree of assiduousness and just flicking the floss down to the gum just enough to knock out any gross particles that the brush won’t get.
All I know is anything that gets stuff from in your teeth into the bloodstream is not good for you.