Well firstly that means you're recommending 4 books you haven't personally read without saying they came from chatgpt (and we don't know which 4).
But also the writing style in that comment just feels far more like ChatGPT than someone elses. Like you asked ChatGPT and then edited that, and not that you came up with your own idea and asked chatgpt for help. So when reading the comment it just comes off as any other copy-paste ChatGPT response. The OP could just ask ChatGPT themselves.
It also doesn't scale well. If multiple people in this thread used ChatGPT to answer, we'd have a bunch of comments of mostly the same list. When I tried to asked it myself I got 7 out of 10 recommendations the same.