Just to be clear: I don't think it was malicious, I just think the excuse he gave was bs. I could be wrong -- I'm not a crystallographer, just a nonprofessional expert (I have given talks) at the Fourier transform. I just can't see how a centrosymettrically inverted structure would get some of the helices correct

Ok, downvoted. Can someone explain to me how a centrosymettrically inverted structure will get some of the helices correct?