So it seems Skoda PR went for "ignoring".

They removed the tweet congratulating on win (which was getting negative responses), with the penalty they can point out result change as main reason. None of Skoda Motorsport tweets now mentioned him at all.

They still didn't do a press release, not sure it will come at all.
All other CZ news just mentioned Cais, sometimes Solberg, with no mention of Gryazin at all.

So for now Skoda Motorsport seems safe. Since other rallies are not so visible and won't be the first start of the car it should be less of a problem in the future. For Sweden they also have more winner candidates.

As I mentioned long before the event, one has to question if it was in their best interest to get into this situation at all. "Sell" one more car early (that there is a long waiting list on) at the risk of severe backlash with all kinds of possible consequences.