Much I marvelled this ungainly fowl to hear discourse so plainly,
Though its answer little meaning – little relevancy bore;
Let me ask a quick question. Do you think Boa being the Empress of Amazon Lily was a lie? Do you think when people called her Empress, Princess in her kingdom etc, they were actually lying? Because when shown in the same chapter Boa also didn't have her Empress of the Amazon Lily title as opposed to her introduction.
and the shichi chapter
If your answer to the above questions is yes then I don't know what to say.
It's not like Oda introduced Mihawk 30 chapters ago as the WSS yet again.
And it't not like the chapter was focused on the abolition of the Warlord system, thus Oda included 'former warlord' for each of them and their epithets only.