I wish instead of discussing typos, folks her who surely know better (or author) could shed light on how this project compares to the many other existing projects, like

https://github.com/cfenollosa/os-tutorial, https://littleosbook.github.io/, https://github.com/tuhdo/os01, https://github.com/prakhar1989/awesome-courses?tab=readme-ov...

or even just "OPERATING SYSTEMS DESIGN AND IMPLEMENTATION" by Tanenbaum