I think it could but you would need MOVING parts inside the blade so that the dark 'core' would appear to "follow your eyes as you move around the blade"...imo it would not be worth the time and experimental effort to find the proper slit sizes and spin rates which is why I've said it seems an impractical approach to me...plus you'd have a blade that would be heavy and probably not duelable since the slightest knock out of alignment would be likely to destroy the 'illusion'.
So I kinda doubt that is what he's done...but if so I suspect it would be impressive effort.
He's going to have to put up his methodology because otherwise we will reasonably doubt.
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