Here is what Lumen Gentium states about the dogmatic power of Bishops.
"But the college or body of bishops has no authority unless it is understood together with the Roman Pontiff, the successor of Peter as its head…The order of bishops, which succeeds to the college of apostles and gives this apostolic body continued existence, is also the subject of supreme and full power over the universal Church, provided we understand this body together with its head the Roman Pontiff and never without this head.(27*) This power can be exercised only with the consent of the Roman Pontiff… The supreme power in the universal Church, which this college enjoys, is exercised in a solemn way in an ecumenical council. A council is never ecumenical unless it is confirmed or at least accepted as such by the successor of Peter… This same collegiate power can be exercised together with the pope by the bishops living in all parts of the world, provided that the head of the college calls them to collegiate action, or at least approves of or freely accepts the united action of the scattered bishops…"[LUMEN GENTIUM, 22]
Thus the Bishops’ dogmatic power is nonexistent except when expressly granted to them by the Roman Pontiff. I doubt Sungenis does not very well know this.