If you haven’t noticed there’s a drawing from 草根 in the post. It’s just a reproduction of what was in the paper, not what the final airframe looked like. The point is he didn’t have special knowledge about the project.That's the point, that post was from Feb 2015, actual photos came out around summer 2015.
People only noticed the dual-fuselage paper after he posted the drawing along with WZ-7. There are countless papers of different drone configurations and 6th gen concepts, accurately predicting two large and unique drone platforms months before photo isn't something you can pull off just drawing random concepts in papers.