I say '' Bladesmanship ''..
Most of Roger's Sword wielding fighting style is Blunt damage, so he's not a Swordsman..
Just like you can call yourself a Swordsman and be a Swordsman while most of your fighting style is not Swordsmanship..
You can also wield a Sword as your main fighting style and not be a Swordsman..
Is this Swordsmanship?..
The answer is both, yes and no..