Again, I never separated cutting skills with CoC, of course swordsmanship skills are enhanced with the use of haki, just like any other fighting style.
From the moment Zoro started using CoC as shockwaves to use to blow up his opponent, then this would no longer fit as a swordsman who uses swordsmanship skills.
I also never denied that Shanks had good swordsmanship skills, but like I said, many other characters have good swordsmanship skills and are not considered swordsmen (King, Daz Bones, Law, Ryokugyu, Kizaru, Big Mom, Rocks, WB, etc.