Most certainly true but Shanks>Mihawk is objectively bad writing from Oda. He could've given Shanks an Axes or some other weapon to fight with. The two could've just clashed as opposed to having legendary dules.
The fact that you have:
1)two swordsmen in the story who dueled non stop.
and
2) one them earned the title of strongest swords men and is explicitly waiting for a greater challenge
and this guy is actual some how not the actual strongest its just ridiculously bad writing.
Don't be fooled by his antics.
Mihawk vs. Shanks / Mihawk > Shanks exists outside of daily Zoro-fan delusions because it has its basis in the canon manga.
In Ndule Piece, Mihawk would've had a 1.5B bounty at the absolute max.
The guy has deleted his account and ran away more times than you can count on one hand, and then still comes back on his high horse.