This so-called "research" confirms nothing. It's not even research, it's just a review by a group of known cholesterol skeptics, basically rehashing the same old dogma they have been pushing for a while, and continue to regurgitate time after time. I don't know the answers here, but I would suggest you'd google criticism of this group, for example:
Statin Denialism - CSI
And then there is the International Network of Cholesterol Skeptics (THINCS), a group that disputes the role of cholesterol in cardiovascular disease. They are led by Uffe Ravnskov, author of The Cholesterol Myths, and Malcolm Kendrick, author of The Great Cholesterol Con. They cherry-pick the scientific literature to find studies that support their theses, ignore the flaws in those studies, and ignore the vast body of literature that contradicts them.
I'm not arguing for one side or the other, but when one side comes out with extraordinary claims, they are obligated to provide strong evidence, and the cholesterol skeptics don't do that.