As someone who is building an LLM-powered product on the side, using AI coding agents to help with development of said LLM-powered product and for my day job, and has a long-tail of miscellaneous uses for AI, I suspect you're right.
I skimmed through it and it's a simple and concise overview of the language suitable for a beginner. It is by no means exhaustive. Also, haven't seen anything in there that makes it so that it couldn't have been written in 2015