He's staying in the NBA Draft system.

"After a historic season of watching guards senior Boo Buie and redshirt senior Chase Audige, Northwestern fans will have to put hopes for a ‘last dance’ in 2023-24 to rest.
CBS Sports’ Jon Rothstein reported Wednesday that Audige will keep his name in the 2023 NBA Draft and won’t return to Evanston in the fall."
 
https://dailynorthwestern.com/2023/05/31/sports/mensbasketball/mens-basketball-chase-audige-to-forego-final-year-of-eligibility-keep-name-in-2023-nba-draft/