There is that, and Optimus will take anything he can get.

"I don't mind at all. You're on an organic world called Earth. Unfortunately, the natives are hostile to our kind, and rightly so. A large portion of their planet has been...cyberformed, transformed from dirt and organic life to metal, more like our world, which for them is a horrific thing, in many ways. And it's spreading. We don't yet know how or why - it's one of the things we're working on. I'd guess you came here through the space bridge room?"

There's more, a lot more, but he'll pause to confirm that. Well, not so much confirm as give himself a point of believability from which to continue.