Nah, I don't think the R-Series were let on the scoop. I don't think Mother Brain had a link with her Robots (Like I think FATE had no link with Lynx, which explains how he wasn't fooled by the Circuit), there's the simple fact that Atropos says that Mother Brain programmed her badly.
Robo was programmed to gather data on the humans, and the R-Series, just plain old guard bots (And not very strong ones, at that) designed to guard a factroy for a dome that was hardly functional anyway? Please, they're as important as the Debuggers. If not less.