From Comics Alliance:

A DC Comics spokesperson told CA, โ€œAs acknowledged by the creators involved, the editorial differences with the writers of Batwoman had nothing to do with the sexual orientation of the character.โ€

This reinforces my suspicion that Rob is on the wrong track with his article on the subject. The reason behind the editorial edict is probably a line-wide version of what Marvel did with Spider-Man in One More Day: Nobody gets married, because married characters are somehow less interesting. That's why Superman and Lois Lane aren't even dating anymore.