Except it doesn't.
He did 0 ZERO damage there.
If he was to fight greenbull
He'd be using his sword.
He does a coc wave when he's sat on his ass in the film, yet when he fights or engages the admirals he uses his sword.
Justifying Shanks not being a swordsman despite Brannew & the verse viewing him as such by giving him headcanon CoC abilities is a much bigger and more retarded leap of faith than simply giving Mihawk the edge due to the title.
But the Yankers do it anyway, because the Yonkos are supposed to be some untouchable gods that they tipride. Even if doing so, actively makes a main character's dream hollow.