Yes, Page had learned recording "techniques" that he utilized for Zeppelin but, that has nothing to do with "PRODUCING". That is something entirely different than mic placement or what kind of effect/compression/eq/ or recording secrets of any kind. Producing is about coaxing the best performance out of the band/singer possible, and then knowing when that has been achieved. Its also about song selection and placement. Its also about...the budget! Time is money.
'Jim Dickinson': "Producing is being able to place an idea in the artists mind that hadn't been there before, or one that they had been subconsciously resisting".