is this because the LLM actually reasoned on a better design or because it found a better design in its "database" scoured from another tenured engineer.
We get paid to solve problems, sometimes the solution is to know an existing pattern or open source implementation and use it. Aguably it usually is: we seldom have to invent new architectures, DSLs, protocols, or OSes from scratch, but even those are patterns one level up.
Whatever the AI is inside, doesn't matter: this was it solving a problem.