I thought the same and felt it looked really out of place to have I8 and F32 instead of i8 and f32 when so much else looks just like Rust. Especially when the rest of the types are all lower case.
I really enjoy the website content and appreciate the hard work to create it. Also, thank you to the author for taking action on the HN feedback last year about the AI thumbnails that used to be all over this site. [0]
Certainly, it is full of algorithms, but that's not what this book is about. This book is about possibilities. Its purpose is to present you not only with the prerequisite mandatory knowledge of the available problem-solving techniques, but more importantly to expand your ability to frame new problems and to think creatively.