User blog comment:Hawki/Nova Covert Ops, part 3 - Reflections/@comment-72.197.211.140-20161201173638

To Hawki:

Ok, even if the Dominion knows about the Tal'darim, we don't know how much they really know about them. This could be both from their POV as well as from the player's POV. The field manual was released on Nov 5th, 2015, which was 10 days BEFORE the events of LotV's release. From WoL and HotS alone, we didn't really get to know how the Tal'darim came to be and everything, we just knew they were a separate branch from the Daelaam. Only in LotV were their origins explained. This is why I'm arguing that perhaps the Dominion didn't know a full picture of the Tal'darim, and what kind of a threat they were and all that.