WOULD that be all they need to do?
Either way i think any union without them reciting the creed is a false one as you said.
The article by the coptic priest tried to say it was political which is a red flag right there. The 7 Councils stand. They were not political charades regardless of whether the accusation comes from a Copt or a protestant..
They are Orthodox in every way but Christiology. They would simply need to recite the Creed and get rid of their heretical books.