I think they're making wild assumptions with very little evidence, and this line pretty much confirms it:
Robert Kelly of the University of Wyoming applauds the discovery of the female hunter but isn't convinced by many of the other potential cases. He points out that having tools in the same grave as a person doesn't always mean they used them in life. Two burials were female infants found with hunting implements, for example. Buried tools could also have been offerings from male hunters to express their sorrow, he says.