No, it wasn't there in 2.0. Unless you mean unreleased versions of 2.1, in which case I don't know.Pretty sure that used to hold an emblem in earlier versions. We just neglected to remove it when we moved that emblem.
Just as a general FYI, I wouldn't expect us to ever go back to the obscure easter egg format from previous versions of the game. We now have proper unlockable structures, and we also no longer have weird beta shit to hide into our demos. Instead of doing something weird as hell to access RVZ or AGZ, you should expect to either unlock it normally or just access it in the normal single player campaign =P
I would be fine with a crazy hidden easter egg, as long as it doesn't unlock anything and isn't important in the slightest. (maybe some kind of graphic, or sound? idk, just not something ridiculously hidden that everyone would try to get after going on Youtube and seeing, just like Hyper Sonic)
(C'mon, I know you can hide something [or at least imply it] in there for the next major release... all of the intrigue will keep players coming back to the game!)