You have told us there has not been an alien time travel to the past disrupting things within the past year, but there was one not too long before, in order to optimize preparation for their plans leading up to the desired Alien Disclosure deception. Is one of the limitations of this strategy, that even the alien AI systems are not very good at making future predictions, that they can see what changes might be needed to happen, making a return to the past desirable to enable re-using that time span, but will not know how long a period will be needed to implement the changes fully enough to change the future in the desired ways? In other words, using their time travel technology to manipulate our world more certainly toward a desired end result will inevitably introduce some additional uncertainty about the time it will require to implement the changes effectively?

You are seeing this quite correctly, that nothing is simple. Seeing the future accurately, let alone gauging the timing of events, given the huge number of variables in play and the many uncertainties involving consequences of the smallest influences, not to mention the larger impacts, there will be quite large variability once cause and effect play out in the real world, to see where you end up and when, with respect to what is desired to happen in going back for a redo. While the decision to go back in time to achieve greater certainty of an outcome will indeed increase the probability of it coming about, there are never guarantees and, indeed, there will be new uncertainties with every new variation and altered strategy foreseen as being useful. But until implemented and the end results begin to accrue, they will be accompanied by many variables, not only the timing of individual steps taken, but their impact. Hence, there may be a longer timeline than desired as a result of the redo, rather than a shortening to the time needed to reach a large-scale goal. But keep in mind, what the aliens are wanting is their desired outcome to be successful. They are not concerned as much about the time it takes. They are willing to bide their time, knowing it will pay off in working systematically and readjusting strategy as they go, getting feedback from their AI systems as well, noting progress along the way and feeding back in the interim, changes taking place in order to predict on an ongoing basis how they are doing and what more might be needed. So they are willing to sacrifice in taking a longer time period to get where they want to go, rather than take the trouble to go back in time which is much more disruptive and adds new uncertainty into the mix as well. Part of their overall strategy is devoted to balancing relative risks and advantages needed to optimize selecting among the choices available.