Talking to Byron about it on fastlane. What he said makes sence. It seems that someone got mixed up when making the revision for the HZ book and put HX stripes in there. It makes sence because they are exactly the HX stripes. Not HZ. Im convinced. It does not make sence otherwise. So yes. Seems that its a major typo!

WB Sandmans. Well no. However I do have this article.