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Horseshoe "blood" is blue, and it's not actually blood it's hemolymph. It is blue crab blood. Blue blood from a crab.
Blue blood from a horseshoe crab yes. Blue crabs are also a thing and horseshoe crabs are always referred to with the word horseshoe in front. So calling them just crabs with the word blue in front is a poor choice if one cares about communication.
horseshoe crabs are always referred to with the word horseshoe in front
They weren't in this case, so that "always" seems to be a stretch.
if one cares about communication.
It's made clear in the article. If one cares about communication they're reading past a headline.
