The argument is overstated and the metaphor includes the proof (of the pudding) where do they think the curry comb, the horse clippers, the blanket and the vets drugs come from? The horse is fragile. There is significantly more at play keeping a horse alive in the modern world and it includes heavy industry, mining, science, and legislation.

Just like the LLM. It demands more than hay and tack.

I could also point out the horse .. was superseded about 100 years ago. If you are a rich AI winner and live in a london mews house. That's a horse box.