No, just providing examples of Presidential power to terminate. No different than when President Obama fired General Stanley McChrystal, relieving him of his command and forcing him into retirement. McChrystal's appointment was confirmed by the Senate but Obama still fired his ass. President Obama also fired General James Mattis, another appointee confirmed by Congress when he earlier replaced the dishonored General David Petraeus following the Paula Broadwell e-mail scandal.
Where do you come up with the fantasy that "Watt was elected by Congress"? Congress does not elect executive branch leaders. They are nominated or appointed by the President and then confirmed by Congress. Obama appointed Watt who was subsequently confirmed by Congress prior to assuming his term of office.