That’s my WAG as well, but many urban fantasy writers count that as meaning “cold iron” but not “steel”, and their definitions have very little to do with metallurgy; many seem to think that if it’s black it’s “cold iron” and if it’s shiny it’s “steel”. Iron salts and complexes (such as hemogoblin) aren’t a problem; steel is or isn’t depending on the writer’s mood, the phase of the moon and the amount of chocolate in the vicinity of the smithy.