Sure, why not. It seems to be a pretty good exposition of the material. When I got interested in this stuff many years ago I worked my way through the 'typing rules' in the coq (nowadays rocq) manual. That is a 'slightly' higher friction way of learning this stuff. This document seems to be more pedagogical.
I have a personal coq/rocq project regarding the verification of software so for that purpose it is highly useful. I also wrote a proof assistent myself (https://github.com/chrisd1977/system).
