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@Lukas
i don't know, but I don't think it's meant to move. If it's like the above linked photo inside, it appears the only way to prevent the hub from rotating inside the flange thread is using glue. the threads were probably wound onto the hub on during manufacture, with a healthy coat of glue, then placed in a jig to set before laminating/glueing up the kevlar sheets that make the side?
Like you say, though, as long as the hub can't rotate inside the flange, it should be fine.
Edit: to my eye, in the image above, the visible hub threads are coated in some kind of glue/resin, which seems to be the only thing preventing the hub spinning.