How do you keep genocide a secret?

Yet another plot hole was using Deucado as a prison planet, kidnapping the mandasurte and holding them on that world for 19 years until an asteroid came and wiped them all out. How do you keep something like that a secret?

Originally, in the long-form version of Rome's Revolution, I thought the Overmind of Earth was an active conspirator in the plot to wipe out the mandasurte. We still see hints of this in Rome's Evolution when Virga admits that Helome was created to be an ethnically pure planet.

But how do you send Vuduri back and forth to Deucado and still keep its true nature under wraps? Answer, I didn't.

The way I figured it, the Overmind sent a contingent of Vuduri to Deucado to oversee the resettlement of any mandasurte that wished to leave Earth. But it started as a separate-but-equal kind of thing. I then twisted the story so that a contingent of MASAL-controlled Vuduri (actually Onsiras) came to Deucado and "reprogrammed" their mission. The Vuduri on Deucado had no knowledge of the Onsiras so being sheep-like as they are, they believed their new directive.

I don't think it is practical but the Onsiras planned on keeping the Vuduri stationed there planet-bound for 19 years. If you ask me, that's a long time to keep such a deadly secret but luckily, Rome's Revolution swept over the planet and protected me from having to come up with a better explanation.