You already said that you think it was called 1-and-1 based on trying to hear nat sound underneath the TV announcers.
If it was called that way, and communicated that way at the line, why did no Iowa State player move initially on the miss? Vroman doesn't attempt a box out, Homan just stands there, Stinson doesn't react until after the KU player gets the rebound.
When the whistle comes immediately after the shot goes in, that tells me the officials already knew they ****** up, but instead of killing the play they let it finish. Frankly, it doesn't surprise me that between Hooker, O'Neill, and Janssen they let that happen.