It could be explained with either the genetic founder effect; the strand of greenskins brought to the warhammer world by chance lacking the technological knowledge, and all their decendants because of this lacking it, mutation caused by the collapse of the gates destroying those genes, or the Old Ones before their fall while failing to exterminate them, managing to at least diminish their threat by removing it with their magic-technology.
Or you can choose to not take the "insidious spores" statement to not mean spores literally, but rather as a term for the influence of pests...


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Arnizipal
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