I wonder if what you're noticing in Fabrice's code is a lack of _abstraction_ beyond whats obviously needed to get the job done. It's not spaghetti IMHO, I think its what code looks like when you're smart enough to just hold most of the problem in your head. I am speculating a bit here, because I am not that smart.

If I had to describe it in aesthetic terms I would maybe say brutalism?