Yes and No. Yes in terms of what it looks like in the film. But no because it took inspiration from multiple designs including a WW2 Horten Design.
However, similar designs were the XB-35 and YB-49.
Other than it being a delta flying wing design, I do not see the direct resemblance at all. I believe they were purely referencing the XB-35 and YB-49. Which is a shame that they did not use the 6 engines Horten XVIIIA or the less aerodynamically smooth Horten XVIIIB revision.
They weren’t apparently. A lot of inspiration came from the Horten H.XVIII. Considering it was inspiration, don’t really expect theme to keep the design looking really at all similar in appearance to the Horten XVIIIA, since many movie props may have been inspired from irl but look nothing like what they were inspired by.
love flying wings! +1000000000000000000000000000000000000000+++++++++