Well yeah, obviously. But the Second Incursion node tells a story of its own.
strategic impulse: orion arm arteria threatened: coagulate, coordinate, repel
So the Second Incursion is the Shivans responding to defend what's apparently a significant strategic/logistical route. Straightforward enough. We can also conclude that if the Shivans need to move a fleet around, it's only natural that they'd pass through here.
The NTF alone was not enough to trigger a cull. Shivan aggression in the Second Incursion was an autonomic response, at first...until their priorities changed.
Why did their priorities change? There's obviously something going on here.
apatic anima disseminate: engineer transabyssal gate. strategic transitional event imminent. notify exostotic elements. cognicide contingency to active.
And now we can confirm that the juggernaut fleet destroyed Capella as a means of deploying elsewhere. Assuming that transdimensional travel is normal for the Shivans, it might be simpler to hop between the same region in two universes than it is to travel vast distances within the same universe. In this regard, the Capella system might have been a convenient route between the GTVA's universe and AoA's universe, which the Shivans were previously unable to exploit due to the node being closed by the Ancients.
apatic anima supervisory issues covert resolution: execute roadblock. generate transabyssal connection. stand by.
The use of "covert" here is what really bugs me. Why covert? From whom? There's no need to be covert around the little fleshy pink things and less-little but equally fleshy yellow things, they don't get it anyway. From the other Shivans? That doesn't make any sense. From the Vishnans? Now there's an interesting thought--the Shivans using the premise of a roadblock to make strategic movements without drawing the Vishnans' attention. And the only reason I can think of for them to do so is AoA:UT, in which the Destroyers finally clash with their Preserver counterparts.
We know that the Shivans and Vishnans both possess a capacity for simulation that borders on prescience. If the Fedayeen can project ahead 30 years using a single Shivan corpse, how far ahead must the Shivans themselves see? 20 years would be nothing--the equivalent of an ambush in a war that had yet to begin.