It is ephemera. We're still not sure exactly what place ephemera will
occupy in the BrickLink catalog in the future (or if it will have a place at
all). We're not even certain how we're going to define the term. Until
we get it figured out, we're trying not to add any ephemera. This particular
item was mistakenly approved.
I kind of understand it, it will be hard to keep a catalog of everything Lego
ever produces... Wish we could.