If they did, this might mean they also created the Death pantheon (Winter Queen, the Primus, Kyrestia and Sir Denathrius).
Also, we know Sargeras was started the Burning Crusade after he discovered a group of void worshiping Dreadlords on a Old God infested world. Yet, we know Denathrius created the Dreadlords.
If this is the case, Sargeras was tricked by the creations of the creations of his Titan brethren.
Whatever Blizzard is cooking for the story, I hope they leave gigantic plotholes unaddressed. #entertainment