I note that he appears to be wielding two axes if he equips one. I don't know if he actually doubles the effects though - doubt it. So it's purely cosmetic and waaaay overstated in his description.

Im trying with one handed axes that ive crafted. I can equip a shield with the weapons but not a second axe.

Like weregamer1 said on the graphic he is double wielding axes when in fact he is only holding one. The stat increase is not higher though, only gives what the weapon says, no bonuses.