Only planes that actually logged some combat flight hours are actually available in game. However, the plane in the OP is (I'm guessing a revised build) of the other flying wing (which was significantly larges due to wingspan). As far as I can remember was that the Nazi's constructed it with the plans of utilizing it to drop a nuke on the US eastern seaboard (I want to say their intended target was NYC, since it was an economic powerhouse).
However, I seem to remember it having 4 prop engines - but my memory isn't the greatest, so I'm possibly wrong. I might have to do some research on this later on today.
Overall though, these planes were prototypes and were never "combat-worthy" or even used in combat, so they would never appear in this game.
