Looks to me like a cunning bodge to reduce unsprung mass. The wheel seems to slide up and down the machined bar courtesy of those four shiny rollers. Because none of the yellow bits move with the wheel, the only unsprung masses are the wheel, the roller assembly and part of the Ohlins shock.
Got any pictures of the other side? I'd guess there's no fancy gubbins on that side, with the bottom end of the shock simply attaching to the other end of the wheel spindle.
Richard