He's clearly doing a bit where he pretends to be confused and incompetent, and the punchline of the video is that he ends up with a working Windows CE port. He did a bit of soldering on the N64 board in the video so I think he probably does know what he's doing to a certain degree.

That said, LLMs have gotten extremely good at this kind of thing and you'd be shocked what you can do with this kind of low level work.