TCB did an awful translation.

覇気is clearly mentioned, yet they omitted it. This puts the fucking debate to an end that swordmanship doesn't involve haki.

Rocks’ swordsmanship was like that of a giant hammer or cannon blast,
famous for its Haki that blew away everything in the surroundings.

Hawk-Eye Mihawk
Former Warlord of the Sea,
Possesses swordsmanship surpassing even Red-Haired Shanks!!
As the world's strongest swordsman,
This bounty!!
3.59 billion berries!!

剣技 used by both.

ITS FUCKING OVER SHANKSFAGS MIHAWK> SHANKS