From OP:

> [A]fter decades of research and billions of patient-years of use data, it doesn’t appear that people taking statins are at greater risk of these conditions [cognitive impairment, dementia, hemorrhagic stroke]. In fact, population studies actually suggest that statin use is associated with a reduced incidence of dementia, but observational studies like these are incapable of determining a cause-and-effect relationship.

In other words: no, it doesn’t. The article is however a good overview of cholesterol metabolism in the brain and effects of statins.