Next week's homework has a mate in 1?

On calculation problem #4 of Killer Homework Club Homework 124, isn’t Qxg2# mate in 1? It says black to move and black isn’t in check and his queen’s not pinned. Am I just blind or is this an error? This week cant be that easy right?

There is an error, Jacob told me. I will update the file in a few moments.