Warlocks - Power Absorption

I wanted to ask something which I think it's weird. Many pages about Warlocks the power of Power Absorption is listed on their infoboxes like they possess that power. If they were seen using that power like Parasite Demons. Then I wouldn't mind. But they were only seen using those Power-Sucking Athames. I am suggeting that the power of Power Absorption should be removed from their infoboxes and add only a Power-Sucking Athame on the section of Magic items.