This dialogue suggests otherwise. The gorosei didn't even know Lulusia was affiliated with the revos. The moment Sabo's location was known Imu proceeded to nuke the island.
Where is he?!
In Lulusia Kingdom!!
Five Elders: !! Lulusia..
How…
Imu: …….
Marines: it’s one of the nations from the Eight Nation Revolution that happened recently, a perfect hideout for Sabo…
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Five Elders: I see…
What an unlucky man……
No, perhaps this is fate…