But this means something. All the manga hyped up giants. Sure, usually it was all narrative and zero feats, but since EH we have seen plenty.
Now, Erbaf is even stronger than Wano and the strogest Samurai was Ryuma; why Harald, the strongest ever of a nation stronger than Wano, should be a problem?
I expected Harald to be stronger than prime WB? No, but if he is, there are no problems.