There is nothing particularly odd in the fact that a Qindred artifact has life-extending properties. Perhaps Qindred is the one true religion, or perhaps other religions have similar artifacts.
I don't see anything particularly vampiric in the way the artifact is supposed to work. It is not described as stealing life from other creatures, for example.
We have never been informed that Qindred are vampires, or that vampirism is exclusive to the Qindred.