My feeling is that the Fabia Evo is a step forward but not yet a big one. On gravel at least the drivers have been complaining about a loose rear end, so maybe there is some work to do. Kalle himself said he felt there is more speed in the car when the set up is right.
Also should consider, as Mirek pointed out, that Kalle is leading the category comfortably so no need to push too hard. Lindholm has nothing to lose.