Read it carefully as it's from 2011 and specific to winery vineyard pellets, I think. So unless
@YYCRed is discussing these pellets made from grape vines, this is not applicable.
However, if you are concerned about health issues surrounding cooking pellets, you should investigate how tree bark harbors potential toxins for decades. This doesn't really concern me, but it's far more concerning than food grade oils used to lubricate an extrusion jig while making pellets from grape vines. Many manufactures use tree bark in their pellet manufacturing.