This is mostly because Absolam was never shown to encounter anyone confirmed to have CoO, but he was at Marineford so it is speculated that he did off screen.
Then again we have seen some techniques that conceal your presence,like whatever the minks do or the.
This devil fruit is wicked.
With this ability, his swordsmanship skills are more dangerous than ever before.
Vivamus dapibus mi ut elit fermentum tincidunt.
He ended up getting killed and his Devil Fruit ability was taken by none other than the Captain of the Second Ship of the crew, Shiliew of the Rain.