I disagree.
Sword skill is swordsmanship.
When Oda states that Mihawk has even greater sword skill than Shanks, it means he has better swordsmanship. And since being a swordsman = using swordsmanship, then it follows logically that the statement means Mihawk is a better swordsman than Shanks.
Skill with the sword cannot be separated from other stats like haki and strength.
To support this, the statement continues with "As the strongest swordsman in the world..."
Sword skill is swordsmanship.
When Oda states that Mihawk has even greater sword skill than Shanks, it means he has better swordsmanship. And since being a swordsman = using swordsmanship, then it follows logically that the statement means Mihawk is a better swordsman than Shanks.
Skill with the sword cannot be separated from other stats like haki and strength.
To support this, the statement continues with "As the strongest swordsman in the world..."
Really?.. Who would have never guessed..
Greater Swords Skills =/= Stronger Overall
Stronger Swordsman =/= Stronger Overall
They didn't say that he was Stronger than Shanks..