But since they knew they needed him, had him born through what could be called (in the broadest sense a rape) they knew they were going to have to save him. Looking at it in that sense that they were going to make sure he fulfills his destiny for them, takes all the tension out of the series. They intervened to protect him from a situation that would kill him. Sounds pretty close to DEM.
But, by definition, a DEM comes out of nowhere and does not logically follow from anything that has come before. In this case it did, so it wasn't a DEM.
It can't be claimed it was a DEM just because it was some gods who did it.