Like I tried to say, I don't know how NIL has affected the old "hiring an agent" restriction.
Plus, I don't give a rat's patootie whether he gets to "improve his craft" in college. One of the lessons we all have to learn in life is living with the decisions we make. He made a decision. It turned out to be wrong for one or more reasons. Now he can learn to live with that decision, along with learning about a foreign culture and improving his craft, by playing outside the US. He couldn't care less about an education, he just cares about playing basketball. Well, now he'll get an opportunity to just play basketball.
Oh, and I don't think college basketball was any poorer by not having Kobe Bryant, Kevin Garnett, LeBron James, et al., play for a year before they turned pro. They would have done that under the old "hardship draft" since there was no "one and done" at the time.