Oh sorry, they “just didn’t have time” for the first time in how many seasons? Hours before the episode. Totally believable.
https://www.msn.com/en-us/tv/news/south-park-abruptly-cancels-wednesday-s-episode/ar-AA1ML2Bg
It was right after the Kirk shooting.
They also cancelled all reruns of an episode where Cartman dressed up like Kirk, according to the Wikipedia article about the shooting.