Yeah, the "flutter" would put off some flash & even a small amount of pressure wave vibration ... but, the few videos I've seen of him vertical jigging a RR, he was doing it in murky/muddy water conditions. He also, of course, used RR's because they're one of his sponsors ... so, he didn't compare the RR's against a regular hair/feather & bladeless jig to see (show) that the RR's blade made a difference. Not that I would have expected him to, or that even if he did it would have shown the RR vs a regular jig as a tie or the RR losing out. (one does not keep paying sponsors very long when they show them to be equal or inferior to other commercially made products)
And I'm a big fan of Road Runners, so don't get me wrong. They've put a LOT of fish in my boat over the decades of me using them.