I suspect that the fake hologram is shown to the people who choose to go out and clean, it gives them a sense of peace perhaps, but it doesn't explain why those others before her would actually clean the lens and then go over to the tree, so far she's the most level headed one who has put all the pennies together so naturally she wouldn't panic, whereas I fully expected the others to panic when they see the faked world.
The other side of it is, is this wasteland also a hologram? So we know that the screens in the silo show what is assumed to be the real world out there, whereas in the real world the projection of a hologram is shown to those that go outside, this makes no sense, which leads me to think all instances are holograms and these fields of silos are some type of future experiment where each silo is somehow feeding into a greater machine outside of the silo.