I take it like this:
The consult has spent twenty years testing kellhus abilities and will be aware of his sensory abilities: meaning they know kellhus will smell the sranc and bash rag immediately upon arrival. Which he does. There is no way they can be ignorant of this ability post ishual war.
But they still lay a trap they know will not work. But they lay a second trap hoping the first will conceal its existence long enough and they bait the trap.
The second trap is the nuke, they know kellhus will anticipate a second trap, and indeed, kellhus does as he immediately begins excavating In search of the trap.
But they have to bait the trap.
Aurang is the bait, Aurang appears in order to lure kellhus away from finding the nuke.
But here is where it goes pear shaped. Saccarees, does not summon kellhus to take the bait.
Kellhus as a result finds the nuke and is able to salvage the ordeal from certain defeat.
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