If I had to make a guess, it would be that he acknowledges, as we all should, that vaccinated or not you can still catch and spread the virus. He is certainly vaccinated, due to his daughters precarious situation. However, knowing full well that a year of travel in crowded places, and in US cities where many are not vaccinated, he has a high likelihood of catching and transmitting the virus to his precious daughter he has decided not to play. I'm sure he wants to play, but it's not worth the risk, and he doesn't need the cash.