Article 1, Section 9, Clause 8 states: "No title of nobility shall be granted by the United States: and no person holding any office of profit or trust under them, shall, without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state."
The article you cited didn't even get the cite from the Constitution correct. Article 1 of the Constitution is addressing the Legislative Branch, not the Executive Branch of the Constitution.
There is no violation of the Constitution on this matter. This clause actually references the Senecure Clause of the Constitution. (Article 1, Section 6, Clause 2) Which, if you look up, deals with the Legislative Branch of government, not the Executive. Chairing a meeting is not a violation of the Constitution.