Oda would laugh at you if you told him Kizaru is a swordsman. Dude doesn't even carry a sword. At best you can make an argument semantically, narratively speaking it's irrelevant, he isn't confined to, or measured by, any swordsman standards. Funnily enough Fujitora has shown less actual sword skill but his character makeup is that of a swordsman, not Kizaru who literally doesn't have even have a sword.
This fanbase is caught up in some of the most nonsensical debates and this never ending sword debate is at the forefront.