I think there is a misunderstanding here somewhere. I'm not saying Enma is providing someone else's haki, or some weird form of haki that the sword itself produces.
@HA001 was saying all Enma does is pulls out Zoros haki, and that's it. That is factually wrong, because whatever Enma is doing, it is making the haki strange. So it's clearly altering it in some way, and not just pulling it out. Zoro himself does not have strange haki. Enma is doing something to make it strange.