[LeanderK]

There's usually a difference between statistics and probability theory, so I was also expecting the measure-theoretic foundations of probability (the advanced point of view). Things like "Covariance, Correlation and Regression" are not about (advanced) probability in a literal sense.

Or, to provide another perspective: The field of stochastics is bigger than just statistics. It includes probability theory as its foundation and then applies it to different domains, including but not limited to statistics.