It is concerning to see a proof of mathematical equivalence being interpreted as an unconditional creation of equivalence. While this proof demonstrates a relationship, it does not create it and, more importantly, it does not guarantee its universal practical applicability. The risk management systems of a central bank like ours require rigorous validation and stress tests for any model, because real market conditions, including liquidity shocks or regulatory changes, can render such theoretical equivalences irrelevant. For example, even if an equivalence is proven between sensitivities via fixed points and KKT, a sudden revaluation of the Swiss franc would impact the efficiency of these models if their assumptions are not properly adjusted. Caution dictates treating this as a conditional rather than a certainty.