Its just some dumb agenda , but still a fun one.
Anyway most likely is comes from desperation based on Mihawk irrelevancy in story so far. He does nothing, appears rarely and his influence is non existent for everyone except Zoro who shares specific dream related to him . So his fans try to bring him up because Oda wont.
He was completely irrelevant in Marineford where all aura and importance was given to Whitebeard , admirals , Shanks , Blackbeard. He got stalled by Vista and was uncapable of killing Luffy despite trying it. Buggy tanked being cut in half by him so his haki is trash too.
Mihawk was 4 years old when Xebec died , Oden and Roger died later so all superior swordmans had to die so Mihawk could get his title. In fact he never even defeated Shanks in their duels so his is not confirmed stronger than him too . Most likely he is now that SHanks became a cripple.