For me, this was probably one of the biggest disappointments from GW in the past couple of decades. Abandoning the original aesthetic and running with whatever the fuck Votann are supposed to be was such an anticlimax.
They didn't even have to be their own distinct faction. We could have had Squat auxiliaries for the Imperial Guard. A standard squad, a unit of bikers and some heavy weapon teams like the Mole Launcher and Thudd Gun. If they really wanted to push the boat out they could have given them the Thunder-Fire Cannon as a terrain/artillery piece.
They would have served better as a nice callback/bonus instead of another unbalanced, half-finished faction.