All the way back in May of 2019, EB Games Canada added a listing to their site for Biomutant on Switch. Now 5 months later, GameStop has done the same. Since EB and GameStop are all the same company, it's not surprising to see the listing pop up. That said, since so much time passed between listings appearing, I'd say that just increases the likeliness of the game actually heading to Switch.
Second retail listing in 5 months