I see no reason to believe that Godric could cast the True Patronus. Even if he knew enough to ruin his ability to cast the traditional one(and knowing that it was literally hiding from death would likely be enough to make him disdain it), that doesn’t mean that he could take the necessary leap to using the True Patronus.
I see no reason to believe that Godric could cast the True Patronus. Even if he knew enough to ruin his ability to cast the traditional one(and knowing that it was literally hiding from death would likely be enough to make him disdain it), that doesn’t mean that he could take the necessary leap to using the True Patronus.