Bullshit headcannon.
No he wasnt...he has potential to be that lvl of Oden. The familarity of Wado is helping in helping get to grasp with Enma. He will master before the FF. Wado helps him in learning how use such blades.
Tenguyama : “The only Swordsman Before or after who has EVER tamed this sword was Oden”
Zoro : “If I get used to this sword, I’ll be stronger”
Tenguyama : “You are getting used to Enma quickly because of your familiarity with Wado already since they are made by the same person”
Tenguyama : “This sword is yet to be a black blade but in your hands, it will rise in the ranks”
You realize not even Oden made Enma black and yet tenguyama witnessing Zoro’s strength is already talking about Zoro potentially surpassing Oden to make the sword black
But according to you Zoro is gonna end this arc, “near Oden’s Level but not quite” and even then, he won’t have reached that “Near Oden Level” without Wado feeding him mystical Enma using powers as if Hitetsu didn’t just say it was Zoro’s familiarity with a similar blade and nothing else