Like he says, the "comment" describes what he wants to do. That's not what humans are interested in. The human already knows "what he wants to do" when they read the code. It's the things like "why did he want to do this in the first place?" that is lacking in the code, and what information is available to add in a comment for the sake of humans.

Remember, LLMs are just compilers for programming languages that just so happen to have a lot of similarities with natural language. The code is not the comment. You still need to comment your code for humans.