(jus read that they - FSCL- HAVE lodged an appeal with UEC).
I doubt that will go anywhere - it's the UCI commissaires wot dun it, not the UEC, so it would be like appealing to the ASO about a TdF sprint relegation.
The UCI's grounds for appeal are information not available to the commissaires (only), so that's either Brand's power data, or non-TV video footage.
If they can't find any new data, that leaves CAS, and I don't see the FSCL being willing to stump up what that would cost.
I've seen a fair few similar road sprint deviations result in relegation, and even more that were ignored.