Yes, I happened to study how the Fiat-Shamir transform works a couple years ago, but I only saw it in the context of using it to transform an interactive zero knowledge proof into a digital signature scheme.

So, if the prover can know beforehand how an hash function behaves, wouldn't this make it a more general attack on hash functions (so potentially even worse than how it is presented in the article) and the Fiat-Shamir transform is only broken as a consequence of it relying on an hash function? If not, why?