Your logical fallacy is appeal to authority
hCG can cause shutdown on it own via negative feedback loop on the hypothalamus and the pituitary. Why would you want this during PCT when your primary goal is to jumpstart your HPTA? Suppressing GnRH expression isnt something you want during PCT. The usefulness of HCG is during a cycle and that is because it acts as LH in the testes maintaining endogenous hormone production and responsiveness of the testes.