I gave the term a Google, and it is a thing I've seen before (in Terraforming Mars, for example), so it's nice to put a name to the feature.

However, I don't think that's what you'd call what the Dark Souls Board game has, because the holes go right through the board, which only has one layer. You can see what I mean in this image. I suppose one could consider this as a crude implementation of what dual layer boards are implementing, but I think that part of why this is so satisfying is because it is a proper hole.