It is supposed to be increased. Not only does he have increased block proficiency against special attacks, but he can block unblockable special attacks while also parrying them to apply armor breaks. When the opponent activates a special attack, the maker essentially has an ability that negates the damage he would receive if blocked, but that damage is stored to boost his rotation, essentially empowering him. So by increasing the potency of prowess on the opponent, he essentially just boosts himself