Probably not the fact that Dominions will join Enigma, but he knew the timeline of Stasis was collapsing before pulling Rasputin out. We clearly see he and his team can observe what is going on in different timelines in RoPX#1 even from No-Place (outside time).That means he knew the robots wanted to join a Dominion while observing the Stasis timeline. I guess we have to see how this pans out, but already his plan doesn't seem viable.