Yes, I know.
If you read on, you will also note that the term “supreme authority in the Church (as a whole that is)” refers ALSO to the Ecumenical Council.
You are misinterpreting the Canons and the readers may be misled by this contention.
The supreme authority for an ecumenical councul is not itself BUT only the Supreme Pontiff in Rome. Only he has the power to convene it and to ratify or discard whatever of its acts are pleasing or displeasing to him. NO supreme authority resides in an ecumenical council.
Here are the canons on this matter from the Code of Canons of the Oriental Churches.
Canon 50 - §1. The college of bishops exercises power over the entire Church in a solemn manner in an ecumenical council.
§2. The college exercises the same power through the united action of the bishops dispersed in the world, which action as such has been initiated or has been freely accepted by the Roman Pontiff so that a truly collegial act results.
§3. It is for the Roman Pontiff, in keeping with the needs of the Church, to select and promote the ways by which the college of bishops is to exercise collegially its function regarding the entire Church.
Canon 51 - §1.
It is for the Roman Pontiff alone to convoke an ecumenical council, to preside over it personally or through others, to transfer, suspend or dissolve it, and to confirm its decrees.
§2. It is for the same Roman Pontiff to determine matters to be treated in a council and to establish the order to be followed in the same council; to the questions proposed by the Roman Pontiff the fathers of a council can add other questions, to be approved by the same Roman Pontiff.
Canon 52 - §1. It is the right and obligation of all and only the bishops who are members of the college of bishops to participate in an ecumenical council with a deliberative vote.
§2. The supreme authority of the Church can also call others who are not bishops to an ecumenical council and determine what part they take in it.
Canon 53 - If the Apostolic See becomes vacant during the celebration of a council, it is interrupted by the law itself until a new Roman Pontiff orders it to be continued or dissolves it.
Canon 54 - §1.
Decrees of an ecumenical council do not have obligatory force unless they are approved by the Roman Pontiff together with the fathers of the council and are confirmed by the Roman Pontiff and promulgated at his order.
§2. When the college of bishops takes collegial action in another manner, initiated or freely accepted by the Roman Pontiff, in order for its decrees to have binding force, they need this same confirmation and promulgation.
WITHIN a Patriarchate, the Supreme authority is, BY CUSTOM, considered to be the Patriarch.
Wishful thinking? Canon law is needed to substantiate this.