They have such good taste and are so discerning and so darned ahead of the general curve.
First, ahem, way back when they started they published the first ever whale poem published (with beautiful artwork next to it).
Now, they have added the following to their submissions guidelines:
Posting to blogs or online workshops is not in our opinion publishing, so any such poems or other pieces are clearly eligible.
Submit to the Shit Creek Review, people! What are you waiting for?