Odom addressed that in Monday press conference. Basixally:
They thought ref signalled JDJ got out of bounds after his catch and the clock stopped. Headset comms were down, so when they finally noticed time was ticking, they ran Sluka over. Odom said he specifically look at KU defensive secondary rotation and saw they were out of alignment for the call they had coming in, so specifically did not use the timeout
He also said directly if they realized JDJ was in bounds, they would have taken the timeout immediately after the catch