The Xfinity 4K page suggests that it requires a certain model of X1 box. I'd guess it's provided over IPTV which I think would require a compatible app on the receiving device (TiVo).
If you have a Roku or Apple TV and the Fox Sports app it might provide the game in 4K.
If you have a Roku or Apple TV and the Fox Sports app it might provide the game in 4K.