Uhm, no. That third quote there means the President can say, "I need a Chief of Staff, so I'll create the position and hire someone to fill it.", that the Judiciary can say, "we need clerks, let's hire some", and the heads of agencies (who work for the President) can decide they need deputies to help run things, and hire them. And, as they are Executive staff, fire them.
Anyone who works for the President but needed to be confirmed by the Senate, can be fired by the President. Ambassadors, Cabinet officials, etc., all serve at the pleasure of the President. The Judiciary is a separate branch of government.
Most importantly though is Article II of the Constitution - "The executive Power shall be vested in a President of the United States of America." That pretty clearly means what it clearly means.