There are a couple of humorous scenarios. This one, which I previously mentioned as potential issue for Ding. It is highly likely that he has taken the Chinese Covid Vaccine, but that Vaccine is not accepted in the EU. So, it he might struggle to get a visa to Spain.
Another possibility, after all this focus on players now worried about their ratings, how many games others have played, is that Karjakin's appeal is successful and he is allowed to take his place in the 2022 Candidates, and all of this becomes irrelevant.