I found this image from Wikipedia which hints at the trick. The surface is highly polished (tight reflection pattern) and the little pyramids have 4 sides flat surfaces which is going to create a four sided symmetrical pattern with, again, a tight reflection beam. Overall, it is not different from the idea behind the F-117 structure: create very narrow radar reflections pointing away from the transmitter antenna (great idea... until confronted with bistatic radars).

I think that this effect is just the consequence of designing a simple and highly repetive structure and the usual german penchant for mechanical perfection, not of some hidden scheme by the designers. Pareidolia and political propaganda did the rest.

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