Wrong. I'm not saying he is staying, but there are so many things that could be going on behind the scenes that require or benefit Fred only if he is quiet. This could be inking a deal with the Bulls, but it could also include a raise for him, more money to his assistants, a bigger slice of the athletics dept budget for travel, recruiting, operations, etc. Publicly turning down the Bulls wouldn't help here.
It's a major decision. Anyone would take as much time as given to make a decision unless you are 100% sure either way.
While the silence hurts recruiting temporarily, if it helps lock up assistants and get the bball program more operating funds it is probably worth it.
I would love for Fred to come out and declare he is staying, but it is not to his advantage to do so regardless of his decision.