Technically, tanking is taking an attack with no damage. Zoro getting injured means he endured the attack and did not tank it.
Regardless, that’s just aruging semantics. Zoro blocking an attack from two Yonko even momentairly is one of the best feats in the entire manga and there isn’t any way to deny it or downplay it.
Only option at this point is to hope the spoilers are fake.