So I've learned that you:
a) don't have a link
b) rely on conjecture and internet rumors.
c) don't believe a reporter with actual sources and,
d) mock those who have more faith in credible sources than conjecture and internet rumors.
Cool story bro.
Jackson didn't say he left because he wasn't made promises. But, it's not difficult to say "I'll promise you every opportunity to earn playing time as everyone else. You're going to have to work, we all are. If you do, good things will come. I see you as a 3 and d guy. With Jalen's ability to penetrate, you stand to get a lot of kick-outs for open threes. I also need you to help bust zones from deep. Continue to work on your shot, conditioning, strength, and defense. I want to see you develop all aspects of your game, keep getting better, and we can do great things."
But that's just off the cuff.
I don't know what Ollie said, but it was reported that he didn't have a plan for Jackson. If you've got a link to a story with sources, or a quote direct from Jackson or his dad, share it, because the rest is literally conjecture and rumors.