It's basically saying to randomly slop something and see if it gets better. Evolution has physical principles and guard rails backing it. Here there are no principals whatsoever, just slopping the slopper to see if it's somehow less sloppy then writing a gist with a slop machine.

I wouldn't call it karpathys loop I'd call it slop descent. Or descent into slop. Or something like that

Evolution very much involves random mutations that turn out useless or harmful and thus don't spread.

This is in fact less random than how generic algorithms used to work traditionally which encoded behaviors in some data structure that then got randomly mutated or crossed with other candidates in the pool.