Sure seems like Fenix Flexin used AI music generator Treblo

Treblo, an AI music generator company, released an open-source classifier that detects songs created with its model and identified Fenix Flexin's "Rubberz" as likely AI-generated by Treblo. The classifier's result adds to controversy as Fenix denies using AI, posting disputed session clips. Treblo's CEO noted "Rubberz" could be the first AI-generated song on the Billboard Hot 100.