All different reasons they could be using AI
Carti is lazy/on drugs/lost passion for music or he's busy with personal issues
He's using references to hear different sounds to get ideas (also lazy + coincides with #1)
On songs when he can't pull off the singing aspect (timeless) for a wider audience (lazy) or his voice is too fried for some types of vocal deliveries
As already theorized Interscope could have a deal where they use him to test ai and its limitations
Label pushing AI because Carti isn't complying to make what they want him to
Sounds stupid but it saves time for Carti to focus on his own music. With AI they can take a "pop" type approach where a big group works on it collectively to make the best product possible and for a wide audience. Then throw on the AI and use carti's name. Like timeless boosting his numbers without taking away his time for his own music.