A tweet posted from the South Park Twitter page But Whole was coming into the Nintendo Switch. It appears like that tweet had nothing to do with the Change.
If you saw the tweet, it was a GIF file of Cartman from the snow uttering”Nin-ten-do…I am coming”. Many people assumed the game was bound to be out for the Change.
Sadly, IGN reports a representative confirmed to them that South Park: The Fractured However Whole is not coming out for the Nintendo Switch. The game is intended for PS4, Xbox One and PC.
The tweet may have just been a reference to the blizzard which happened in the USA. While it was snowing in the episode, Cartman was waiting for a Nintendo Wii.