Disney hasn’t had the best time with premieres lately.
Poor box office results led to Disney ceding its crown as Universal Studios became the top-grossing production company for 2023, and Disney+ has yet to become profitable (though CEO Bob Iger is still confident that it will be by the end of 2024.) Streaming is a top priority for Iger, so perhaps that’s why this showrunner was fired before his show even officially premiered.