He has no real reason to talk the Cavs unless he has changed his mind on the trade (which he obviously hasn't). I'd be much more interested if James or Irving was reaching out to the other with no response (not that I think either has reached out to the other).
Sure he has reason to talk to the Cavs. They can trade him to any of 29 teams. If he has a preference on where to go, which he reportedly does, it's absolutely in his best interest to keep the lines of communication open.
"We have a deal with San Antonio, but they want to talk to you about whether you'll pick up your option year." No answer.
"Miami wants to know if you'll waive your trade bonus." No answer.
"The Knicks have new management and want to talk with you first." No answer.
"Okay, Sacramento it is, then!"