Richard McElreath has made his course materials available on GitHub.
However, the course follows the 2nd edition of McElreath's book Statistical Rethinking which is not available in a free digital format.
After watching the first lecture in the Statistical Rethinking 2023 YouTube Playlist, I might go ahead and purchase the text and use this course instead of Trevor Hastie and Rob Tibshirani's An Introduction to Statistical Learning (with Applications in R or Python) course.
I also like that this resource has made an explicit attempt to provide code examples in Julia as well as the more popular Python and R.
I wasn't sure who Richard McElreath was so I did a quick search which revealed his position as Director of the Department of Human Behavior, Ecology and Culture at the Max Planck Institute for Evolutionary Anthropology in Leipzig.